Choose the best answer for each of the fllowing sentences
1. ............ if you work harder, you will be sacked.
A. Whether B. If C. However D. Unless

2. I think you should stop smoking.
A. If I am you, I will stop smoking B. If I were you, I will stop smoking
C. If I were you, I would stop smoking D. If I had been you, I would stop smoking

3. If you take the ice out of the fridge, it ...........
A. vaporizes B. melts C. heats D. disappears

4. We should do something to protect water from being polluted ........... we will have nothing to drink in the future.
A. if B. whether C. or D. unless

5. Let's knock on their door to see .......... home.
A. if they're B. unless they're C. whether they were D. if they were

6. Unless we .......... more snow, we can't go skiing.
A. will have B. have C. have had D. had

7. You'll fail the exam ........... you start revising.
A. if B. until C. when D. unless

8. Unless you wash the car, you .............. not drive it at the weekend
A. would B. could C. have to D. may

9. If Peter ............... his car before the drive, he ................ the problem of out of petrol.
A. cheked / will not get B. had checked / would not have got
C. checks / will not have got D. would be checking / will not have got

10. He stepped on the mine, and it exploded.
A. If he doesn't step on the mine, it doesn't explode.
B. If he doesn't step on the mine, it won't explode.
C. If he didn't step on the mine, it wouldn't explode.
D. If he hadn't step on the mine, it wouldn't have exploded.

In this part of the test you must choose the words or phrase which best completes each of the following sentences . ( 10ms)

1. take a taxi, you’ll be late for the lecture.

           A. Unless you               B. If you not                C. Because of      D. For you

2.  the cold weather, she wasn’t wearing a coat.

          A. Although                   B. Because                  C. Since                D. In spite of

3. John can’t make a ………..to get married to Mary or stay single until he can afford a

              house and a car

           A. decide                       B. decision                  C. decisive            D. decisively

4. When you see your friend off at the station, you say: “………………….!”

           A. Lucky you             B. Good night    C. Have a good journey   D. You’re welcome

5. He came home late, so I asked him where …………….

            A. he had been             B. has he been              C. he has been      D. had he been

6. He’s accustomed to …………….to music before bedtime.

            A. listen                       B. listened                    C. listening             D. be listening

7. He drank ……………coffee that he couldn’t  sleep last night.

            A. so                            B. so much                   C. so many              D. a lot of

8. Billy, come and give me a hand with cooking.

            A. help                        B. prepared                   C. be busy               D. attempt

9. Mary always takes great care …………her children.

           A. for                           B. of                              C. to                        D. with

10. All traffic laws ……………

           A. is observed         B. had better observe C. must have observed   D. must be observed 

I. Choose the best answer to complete each of the following sentences.

1. If I were you, I _____________ for a new car to buy.

A. would look                B. will look          C. look                 D. looking

2. If Jenny _____________ ill, she would go out with us.

A. isn't                           B. aren't               C. wasn't              D. not been

3. If there _____________ fewer cars on the road, there would be less accident.

A. is                               B. were                 C. are                   D. be

4. If people really cared about environment, they _____________ waste into rivers.

A. didn't dump              B. don't dump      C. shan't dump     D. wouldn't dump

5. You _____________ so tired if you went to bed earlier.

A. won't be                    B shan't be           C. couldn't be       D. wouldn't be

6. If you really _____________ me, you would buy me a diamond ring.

A. loved                         B. love                  C. loves                D. loving

7. If I knew where she lived, I _____________ and see her.

A. will go                       B. would go                   C. should go                  D. went

8. If I _____________ taller, I would buy this dress.

A. am                                      B. are                   C. were                 D. being

9. Filters do not remove all _____________ from water.      

A. contaminate              B. contaminants   C. contaminating  D. contamination

10.  _____________ is found under the ground in soil, rocks, etc.

A. sea water                            B. salt water                  C. groundwater    D. hot water

11. If I won a lottery, I _____________ a lot on charity.

A. spend                        B. spent                C. will spend        D. would spend

12. If the supermarket is open, I _____________ some food there.

A. will buy                     B. would buy       C. bought             D. has bought

13. I will talk to her if you _____________ to do it.

A. won't want                B. didn't want      C. don't want       D. doesn't want

14. If I  _____________ more money, I would buy a better car.

A. have                          B. had                  C. will have          D. would have

21. All the aquatic plants and animals will die if the factory_____________ dumping poison into the lake.

A. will keep                   B. to keep             C. kept                 D. keeps

23. If the air was clean, we _____________ have to wear masks when going out.

A. wouldn’t                             B. won’t               C. would              D. will

24. If I _____________ you, I _____________ water from that dirty tap.

A. am - will drink                                       B. am - won’t drink

C. were - would drink                                 D. were - wouldn’t drink

25. If he _____________ trash around his garden, the garden would look very nice now.

A. will throw                 B. would throw    C. didn’t throw    D. doesn’t throw

27.  If it rains, we _____________ the match.    

A. cancel                        B. will cancel        C. cancelled          D. cancelling

28.  If I were a tree, I _____________ the rain.  

A. love                           B. loved                C. will love           D. would love

29. The decor inside the house was very_____________.     

A. fantastic                    B. electric             C. mechanic                   D. artistic

30. If she _____________ late, we will go without her.         

A. am                                      B. is                      C. was                  D. were

31. If I _____________ where she lived, I would go and see her.

A. know                         B. knows              C. to know           D. knew

34. If I _____________ the lottery, I would be a millionaire.

A. win                            B. wins                 C. winning            D. won

35. I will discuss that problem with him if I _____________ him tomorrow.

A. see                                      B. sees                  C. to see               D. seeing

36. If I knew Chinese, I _____________ for job in China.

A. will apply                  B. would apply    C. will be applied D. would be applied

Choose the best answer to complete each of the following sentences.

1. If I were you, I _____________ for a new car to buy.

A. would look                B. will look          C. look                 D. looking

2. If Jenny _____________ ill, she would go out with us.

A. isn't                           B. aren't                C. wasn't               D. not been

3. If there _____________ fewer cars on the road, there would be less accident.

A. is                               B. were                 C. are                    D. be

4. If people really cared about environment, they _____________ waste into rivers.

A. didn't dump               B. don't dump      C. shan't dump     D. wouldn't dump

5. You _____________ so tired if you went to bed earlier.

A. won't be                    B shan't be            C. couldn't be       D. wouldn't be

6. If you really _____________ me, you would buy me a diamond ring.

A. loved                         B. love                  C. loves                D. loving

7. If I knew where she lived, I _____________ and see her.

A. will go                       B. would go                   C. should go                   D. went

8. If I _____________ taller, I would buy this dress.

A. am                                       B. are                    C. were                 D. being

9. Filters do not remove all _____________ from water.        

A. contaminate               B. contaminants    C. contaminating   D. contamination

10.  _____________ is found under the ground in soil, rocks, etc.

A. sea water                    B. salt water          C. groundwater     D. hot water

11. If I won a lottery, I _____________ a lot on charity.

A. spend                         B. spent                C. will spend        D. would spend

12. If the supermarket is open, I _____________ some food there.

A. will buy                     B. would buy        C. bought             D. has bought

13. I will talk to her if you _____________ to do it.

A. won't want                 B. didn't want       C. don't want        D. doesn't want

14. If I  _____________ more money, I would buy a better car.

A. have                          B. had                   C. will have          D. would have

15. The farmer had put down some rat _____________.

A. poisoning                  B. poisoner           C. poisoned          D. poison

16. _____________ loss can be caused by noise pollution.

A. sound                        B. hearing             C. listening           D. audio

17. Ships spill oil in oceans and rivers. This leads _____________ the death of many aquatic animals and plants.

A. to                               B. in                     C. from                 D. at

18. Households pollute water sources by _____________ waste into ponds, lakes, and rivers.

A. damaging                   B. dumping          C. losing               D. leading

19. This month’s electricity bill is too high _____________the air conditioner is turned on all the time.

A. since                          B. due to               C. although           D. because of

20. The government has come _____________ a solution to the water problems of the city.

A. up to                          B. up with            C. to with             D. on to

21. All the aquatic plants and animals will die if the factory_____________ dumping poison into the lake.

A. will keep                    B. to keep             C. kept                  D. keeps

22. A lot of fish has died recently because of the _____________ water in this lake.

A. contaminating            B. contaminated    C. contaminate      D. contaminant

23. If the air was clean, we _____________ have to wear masks when going out.

A. wouldn’t                             B. won’t               C. would              D. will

24. If I _____________ you, I _____________ water from that dirty tap.

A. am - will drink                                        B. am - won’t drink

C. were - would drink                                 D. were - wouldn’t drink

25. If he _____________ trash around his garden, the garden would look very nice now.

A. will throw                  B. would throw    C. didn’t throw     D. doesn’t throw

26. Price and availability are the _____________ factors that will determine product success.

A. critical                        B. musical             C. physical            D. medical

27.  If it rains, we _____________ the match.     

A. cancel                        B. will cancel        C. cancelled          D. cancelling

28.  If I were a tree, I _____________ the rain.   

A. love                           B. loved                C. will love           D. would love

29. The decor inside the house was very_____________.       

A. fantastic                     B. electric              C. mechanic                   D. artistic

30. If she _____________ late, we will go without her.

A. am                                       B. is                      C. was                  D. were

Choose the best answer to complete each of the following sentences.

1.  We         to the countryside two months ago.

        A. go                        B. have gone                C. w

ent   D. will go

2. What will you do if you the final examinations?

        A. will pass              B. would pass              C. pass               D. passed

3. I wish my summer holiday                               longer.

        A. will be                 B. is                             C. were              D. has been

4. I asked him                  he came from.

        A. where                  B. who                         C. what              D. which

5. It rained hard.              , my father went to work.

        A. Therefore            B. However                 C. Because         D.So

6. Your sister writes poems and stories,                she?

        A. does                    B. doesn’t                    C. will                D. won’t

7. Laura fell asleep during the lesson                    she was tired.    

        A. so                        B. but                          C. because D. therefore

8. How much                   do you want?

        A. bananas               B. eggs                         C. candies          D. sugar

9. Do you know the man  you met at the party yesterday?

        A. what                    B. which                      C. whom            D. whose

10. Tomorrow the director will have a meeting                                8:00 am to 10:00 am.

        A. between               B. from                        C. among           D. in

11. The doctor advised me jogging every morning.

        A. went                    B. go                            C. to go              D. going

12. The bike                     I have just bought is every cheap.

        A. which                  B. where                      C. what              D. who

13.   We will start our trip 6 o’clock                     the morning.

        A. in/ in                    B. at / in                       C. in / at             D. at / at

14.   He said he                come back later.

        A. will be                 B. will                          C. would be        D. would

15. We                             anything from James since we left school.

        A. haven’t heard      B. heard                       C. don’t hear      D. didn’t hear

16. If I ________________a bird, I would be a dove.

        A. would be             B. were                        C. am                 D. will be

17. The children sang       during the trip.

        A. happily                B. happiness                C. unhappy        D. happy

18. This newspaper          everyday.

        A. is publishing        B. publish                    C. published       D. is published

19. You have lived in this city since 1998,            ?

        A. haven’t you         B. didn’t you                C. did you          D. have you

20. My students enjoy      English very much.

        A. learn                    B. learnt                       C. learning         D. to learn

21. Mai enjoys ________ to music, especially pop music in her free time.

A. hearing                B. playing                    C. listening         D. talking

22. My grandparents love __________ very much. There are a lot of beautiful  flowers and fresh vegetables in their garden.

A. doing garden                                             B. doing gardening

C. do gardening                                             D. to do garden

23. You should avoid ______ too much TV. It’s not good for your eyes.

        A. seeing                  B. looking                     C. watching           D. glancing

24. Nga likes ________ with her close friend on Saturday evenings.

        A. window shop                                            B. window to shop

        C. window shops                                           D. window shopping

25.  Lan used to love _____ front of the computer for hours but now she doesn’t. She takes part in a judo club.

A. using                             B. sitting                        C. doing               D. having

26. Minh is very hard-working boy. He doesn’t mind ______ a lot of homework in the evenings.

          A. making                B. reading                      C. seeing              D. doing

27. Do you fancy _____ around the West Lake with me this Sunday morning?

          A. going                   B. having                       C. staying            D. moving

28. I don’t like _______ up early in the winter days. I love ______ in bed late.

        A. getting / stay                                             B. get / stay

        C. getting / stay                                             D. get / staying

29. Mai’s dad likes _______ spring rolls when her family her parties.

        A. doing                           B. making             C. cooking            D. trying

30. Why don’t we ____ our parents with some DIY project? T think it is useful.

        A. help                   B. do                              C. make                D. give

31. How much time do you spend _______ leisure activities?

        A. on                      B. in                                C. for                   D. with

32. Why don’t you apply for this job? It looks right _______ your street.

        A. on                      B. in                                C. at                     D. up

33. Many young people don’t _______ walking to school or playing active games?

        A. prefer                B. enjoy                           C. suggest            D. want

34. Daisy is _______ social media. She spends lots of time on Facebook and Instagram.

        A. tired of               B. bored with                   C. addicted to       D. curious about

35. _______ leisure time is free from compulsory activities, it is often referred to as “free time.’

        A. Because             B. Although                     C. When               D. As long as

36. On YouTube you can find many videos on _______ all aspects of your English.

        A. surfing               B. working                      C. taking              D. improving

37. Some addicts are teenagers _______ are hooked on computer games.

        A. which                B. who                            C. what                D. whose

38. My sister enjoys _______. She usually walks around the mall, but not buying anything.

        A. going shopping                                          B. hanging out     

        C. window shopping                                      D. doing DIY

39. You can raise a _______ pet like a Neopet if you aren’t allowed to own a real pet.

        A. domestic            B. virtual                         C. weird               D. beloved

40. “My favourite leisure activity is people watching.” “_______”

        A. That sounds so weird!                                B. That’s all right.

        C. OK. That’s what you’ve chosen.                D. Sure. It’s very entertaining.

41. Nick reads the language websites every day because he is trying­_____Vietnamese.

A. learning              B. to learn                      C. learn                D. learns

42. Even though it is weekend, he prefers_____books at home to_____out with friends.

A. read/ hang                                                 B. reads/ hangs              

C. reading/ hanging                                       D. to read/ to hang

43. Hoa is a shopaholic. She loves_____.

A. going shopping                                         B. going fishing             

C. going to the cinema                                   D. going to her club

44. Hung founds a movie club. People join this club because they are_____ watching movies

A. in                       B. on                              C. at                     D. into

45. A: She really_____ collecting coins.

B: It’s more than that. She is obsessed!

A. adores                B. dislikes                      C. hates                D. detests

46. I can’t live without coffee. I’m so_____ to it.

A. addict                 B. addictive                    C. addicted           D. addiction

47. There are many reality shows, comedies and TV series nowadays because people

love_____ TV.

A. to watch             B. watch                         C. waches             D. watched

48. Liz wants to use her free time for helpful activities so she works as_____.

A. a volunteer                   B. a fan                                   

C. a teammate                  D. a partner

49. She is always_____ on something nice and cute even though they are useless.

A. addicted             B. interested                   C. hooked             D. fallen

50. It_____ him so many years to collect stamps. Now his collection is very large and valuable.

A. has taken            B. has spent                    C. has waste          D. has used

Choose the best answer to complete each of the following sentences.

1.  We         to the countryside two months ago.

        A. go                        B. have gone                C. w

ent   D. will go

2. What will you do if you the final examinations?

        A. will pass              B. would pass              C. pass               D. passed

3. I wish my summer holiday                               longer.

        A. will be                 B. is                             C. were              D. has been

4. I asked him                  he came from.

        A. where                  B. who                         C. what              D. which

5. It rained hard.              , my father went to work.

        A. Therefore            B. However                 C. Because         D.So

II. Choose the best answer A, B, C or D to complete the following sentences.

1. If I ________ you, I would look for a new flat to buy.

A. am                          B. will be                    C. were                        D. was

2. You ________ so tired if you went to bed early.

A. wouldn’t be            B. won’t be                 C. will be                    D. were

3. If you really ________ about me, you could call me.

A. will care                  B. have cared              C. would care              D. cared

4. We can’t remove all ________ from water in this river.

A. contaminate            B. contaminants          C. contaminated          D. contamination

5. ________ gas from factories has polluted the air.

A. poisonous               B. poison                     C. poisoned                 D. poisoning

6. The acid rain has caused the ________ to the trees in this area.

A. dead                       B. die                          C. dying                      D. death

7. I had to clean the floor ________ I spilled my juice.

A. because of              B. since                       C. despite                    D. due to

8. She walked slowly ________ she had to carry heavy bags.

A. although                 B. if                             C. because of              D. because

9. I can hear you clearly ________ your loud voice.

A. since                       B. as                            C. because of              D. when

10. Eating too much sugar leads ________ diabetes.

A. in                            B. with                        C. for                           D. to

I. Choose the best answer to complete each of the following sentences.

1.  We         to the countryside two months ago.

        A.go                        B. have gone                C. went              D. will go

2. What will you do if you _____ the final examinations?

        A.will pass               B. would pass              C. pass               D. passed

3. I wish my summer holiday                               longer.

        A. will be                 B. is                             C. were              D. has been

4. I asked him                  he came from.

        A. where                  B. who                         C. what              D. which

5. It rained hard.              , my father went to work.

        A. Therefore            B. However                 C. Because         D.So

6. Your sister writes poems and stories,                she?

        A. does                    B. doesn’t                    C. will                D. won’t

7. Laura fell asleep during the lesson                    she was tired.    

        A. so                        B. but                          C. because D. therefore

8. How much                   do you want?

        A. bananas               B. eggs                         C. candies          D. sugar

9. Do you know the man  you met at the party yesterday?

        A. what                    B. which                      C. whom            D. whose

10. Tomorrow the director will have a meeting                                8:00 am to 10:00 am.

        A. between               B. from                        C. among           D. in

11. The doctor advised me jogging every morning.

        A. went                    B. go                            C. to go              D. going

12. The bike                     I have just bought is every cheap.

        A. which                  B. where                      C. what              D. who

13.   We will start our trip 6 o’clock                     the morning.

        A. in/ in                    B. at / in                       C. in / at             D. at / at

14.   He said he                come back later.

        A. will be                 B. will                          C. would be        D. would

15. We                             anything from James since we left school.

        A. haven’t heard      B. heard                       C. don’t hear      D. didn’t hear

16. If I ________________a bird, I would be a dove.

        A. would be             B. were                        C. am                 D. will be

17. The children sang       during the trip.

        A. happily                B. happiness                C. unhappy        D. happy

18. This newspaper          everyday.

        A. is publishing        B. publish                    C. published       D. is published

19. You have lived in this city since 1998,            ?

        A. haven’t you         B. didn’t you                C. did you          D. have you

20. My students enjoy      English very much.

        A. learn                    B. learnt                       C. learning         D. to learn

21. Mai enjoys ________ to music, especially pop music in her free time.

A. hearing                B. playing                    C. listening         D. talking

22. My grandparents love __________ very much. There are a lot of beautiful  flowers and fresh vegetables in their garden.

A. doing garden                                             B. doing gardening

C. do gardening                                             D. to do garden

23. You should avoid ______ too much TV. It’s not good for your eyes.

        A. seeing                  B. looking                     C. watching          D. glancing

24. Nga likes ________ with her close friend on Saturday evenings.

        A. window shop                                            B. window to shop

        C. window shops                                           D. window shopping

25. Lan used to love _____ front of the computer for hours but now she doesn’t. She takes part in a judo club.

A. using                   B. sitting                        C. doing               D. having

26. Minh is very hard-working boy. He doesn’t mind ______ a lot of homework in the evenings.

          A. making                B. reading                      C. seeing              D. doing

27. Do you fancy _____ around the West Lake with me this Sunday morning?

          A. going                   B. having                       C. staying            D. moving

28. I don’t like _______ up early in the winter days. I love ______ in bed late.

        A. getting / stay                                             B. get / stay

        C. getting / stay                                             D. get / staying

29. Mai’s dad likes _______ spring rolls when her family her parties.

        A. doing                           B. making             C. cooking            D. trying

30. Why don’t we ____ our parents with some DIY project? T think it is useful.

        A. help                   B. do                              C. make                D. give

31. How much time do you spend _______ leisure activities?

        A. on                      B. in                                C. for                   D. with

32. Why don’t you apply for this job? It looks right _______ your street.

        A. on                      B. in                                C. at                     D. up

33. Many young people don’t _______ walking to school or playing active games?

        A. prefer                B. enjoy                           C. suggest            D. want

34. Daisy is _______ social media. She spends lots of time on Facebook and Instagram.

        A. tired of               B. bored with                   C. addicted to       D. curious about

35. _______ leisure time is free from compulsory activities, it is often referred to as “free time.’

        A. Because             B. Although                     C. When               D. As long as

36. On YouTube you can find many videos on _______ all aspects of your English.

        A. surfing               B. working                      C. taking              D. improving

37. Some addicts are teenagers _______ are hooked on computer games.

        A. which                B. who                            C. what                D. whose

38. My sister enjoys _______. She usually walks around the mall, but not buying anything.

        A. going shopping                                          B. hanging out     

        C. window shopping                                      D. doing DIY

39. You can raise a _______ pet like a Neopet if you aren’t allowed to own a real pet.

        A. domestic            B. virtual                         C. weird               D. beloved

40. “My favourite leisure activity is people watching.” “_______”

        A. That sounds so weird!                                B. That’s all right.

        C. OK. That’s what you’ve chosen.                D. Sure. It’s very entertaining.

41. Nick reads the language websites every day because he is trying­_____Vietnamese.

A. learning              B. to learn                      C. learn                D. learns

42. Even though it is weekend, he prefers_____books at home to_____out with friends.

A. read/ hang                                                 B. reads/ hangs              

C. reading/ hanging                                       D. to read/ to hang

43. Hoa is a shopaholic. She loves_____.

A. going shopping                                         B. going fishing             

C. going to the cinema                                   D. going to her club

44. Hung founds a movie club. People join this club because they are_____watching movies

A. in                       B. on                              C. at                     D. into

45. A: She really_____collecting coins.

B: It’s more than that. She is obsessed!

A. adores                B. dislikes                      C. hates                D. detests

46. I can’t live without coffee. I’m so_____to it.

A. addict                 B. addictive                    C. addicted           D. addiction

47. There are many reality shows, comedies and TV series nowadays because people

love_____TV.

A. to watch             B. watch                         C. waches             D. watched

48. Liz wants to use her free time for helpful activities so she works as_____.

A. a volunteer                   B. a fan                                   

C. a teammate                  D. a partner

49. She is always_____on something nice and cute even though they are useless.

A. addicted             B. interested                   C. hooked             D. fallen

50. It_____him so many years to collect stamps. Now his collection is very large and valuable.

A. has taken            B. has spent                    C. has waste          D. has used

UNIT 7 C. MULTIPLE CHOICE I. Choose the best answer to complete each of the following sentences. 1. If I were you, I _____________ for a new car to buy. A. would look B. will look C. look D. looking 2. If Jenny _____________ ill, she would go out with us. A. isn't B. aren't C. wasn't D. not been 3. If there _____________ fewer cars on the road, there would be less accident. A. is B. were C. are D. be 4. If people really cared about environment, they _____________ waste into rivers. A. didn't dump B. don't dump C. shan't dump D. wouldn't dump 5. You _____________ so tired if you went to bed earlier. A. won't be B shan't be C. couldn't be D. wouldn't be 6. If you really _____________ me, you would buy me a diamond ring. A. loved B. love C. loves D. loving 7. If I knew where she lived, I _____________ and see her. A. will go B. would go C. should go D. went 8. If I _____________ taller, I would buy this dress. A. am B. are C. were D. being 9. Filters do not remove all _____________ from water. A. contaminate B. contaminants C. contaminating D. contamination 10. _____________ is found under the ground in soil, rocks, etc. A. sea water B. salt water C. groundwater D. hot water 11. If I won a lottery, I _____________ a lot on charity. A. spend B. spent C. will spend D. would spend 12. If the supermarket is open, I _____________ some food there. A. will buy B. would buy C. bought D. has bought 13. I will talk to her if you _____________ to do it. A. won't want B. didn't want C. don't want D. doesn't want 14. If I _____________ more money, I would buy a better car. A. have B. had C. will have D. would have 15. The farmer had put down some rat _____________. A. poisoning B. poisoner C. poisoned D. poison 16. _____________ loss can be caused by noise pollution. A. sound B. hearing C. listening D. audio 17. Ships spill oil in oceans and rivers. This leads _____________ the death of many aquatic animals and plants. A. to B. in C. from D. at 18. Households pollute water sources by _____________ waste into ponds, lakes, and rivers. A. damaging B. dumping C. losing D. leading 19. This month’s electricity bill is too high _____________the air conditioner is turned on all the time. A. since B. due to C. although D. because of 20. The government has come _____________ a solution to the water problems of the city. A. up to B. up with C. to with D. on to 21. All the aquatic plants and animals will die if the factory_____________ dumping poison into the lake.