n_O2=1.68:22,4=0,075 mol

gọi n là hóa trị của kim loại R, ta có CTC: R₂On

pt: 4R + nO₂ -> 2R₂O_n

_{\(\dfrac{0,3}{n}\) mol 0,075 mol}

MR = \(\dfrac{3,6}{\dfrac{0,3}{n}}\)= 12n

lập bảng biện luận

vậy M là kim loại MG, CTHH: MgO

pt: 2Mg + O₂ -> 2MgO

0,075 mol-> 0,15 mol

m_MgO= 0,15.40= 6 (g)

dc dùng quỳ tím ko bạn

UNIT 7. SAVING ENERGY.

TEST 5

I. Choose the word in each group that has the underlined part pronounced differently

from the rest.

1. A. torch B. sport C. record D. colorful

2. A. tower B. slow C. flower D. down

3. A. balloon B. hand C. band D. bamboo

4. A. prepare B. prepayment C. preposition D. prescribe

5. A. competition B. competence C. competent D. compete

6. A. flow B. row C. know D. now

7. A. fly B. hobby C. energy D. ordinary

8. A. dump B. bulb C. nuclear D. plumber

9. A. dental B. send C. pretty D. petty

10. A. would B. should C. shoulder D. could

II. Choose the words that has a different stress pattern from the others.

1. A. objection B. opinion C. official D. optional

2. A. compulsory B. convenient C. correspond D. communicate

3. A. recycle B. garbage C. prevent D. pollution

4. A. pesticide B. environment C. authority D. suggestion

5. A. complication B. deforestation C. electricity D. disappointed

6. A. problem B. extremely C. mention D. natural

7. A. treasure B. poisonous C. resource D. plastic

8. A. replace B. efficiency C. electricity D. appliance

9. A. energy B. enormous C. expensive D. reduce

10. A. refrigerator B. innovation C. population D. entertainment

III. Choose the best answer to complete these following sentences.

1. I believe that our new manager has the ______ to work well in this business environment.

A. flexible B. inflexible C. flexibly D. flexibility

2. When my father retired, he decided to take ______ golf.

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

3. That’s a nice coat, and the color ______ you well.

A. matches B. fits C. suits D. agrees

4. I come from Vietnam so I am not used to ______ on the left

A. drive B. drove C. driven D. driving

5. The Ao dai is the ______ dress of Vietnamese women

A. beautiful B. traditional C. casual D. baggy

6. I ……English here since I graduated from university

A. teach B. taught C. have taught D. am teaching

7. I wish you ______ here tomorrow.

A. come B. came C. will come D. would come

8. Your teacher writes poems or stories ______ she?

A. don’t B. won’t C. didn’t D. doesn’t

9. Let’s ______ somewhere for a drink.

A. go B. do C. going D. doing

10. it’s raining heavily ______ I can’t go to the movie with you.

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A. and B. but C. because D. So

11. Malaysia is divided ______ two regions

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

12. Mathematics and literature are _____ subjects in high schools

A. adding B. compulsory C. optional D. religious

13. What were you doing when he ______?

A. comes B. to come C. came D. coming

14. Tell me_______ there is anything special that you would like to do.

A. which B if C that D so

15. She asked___________ whether she really wanted to take the exam.

A. anyone else B each other C herself D one

16. When she answers the phone, she often ______ in a funny accent which annoys me.

A repeats B says C speaks D tells

17. I am going to _________all my clothes and decide which to keep and which to give away.

A get on B go through C hand in D look up

18. I must find out _________ the train leave.

A. if B When C as D that

19. Is there a place ____________ we can eat cheaply near here?

A. that B there C where D which

20. He pointed to number 6 and said" That is the house she lives....... "

A there B where C in D in it

21. If you work for us, you'll get somewhere to live ______ free.

A. for B. of C. at D. out

22. They took a pride ______ being the best players of the school

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

23. She still remembered how he had broken down and cried ______ a baby

A. as if B. as C. like D. same as

24. - I'm sorry about that! - Well______.

A. you're welcome B. of course C. thank you D. it's OK

25. Pam, what would you ______do tomorrow morning?

A. like B. rather C. better D. ought to

26. I wish I ______ there yesterday afternoon!

A. was B. were C. had been D. would have bee

27. She saw me, but she didn’t bother______hello to me.

A. to have said B. say C. saying D. to say

28. She’d prefer to go out ______ home

A. than to stay B. than staying

C. rather than staying D. rather than to stay

29. We could not use fire fighting equipment because the water pipes ______.

A. would burst B. used to burst C. have burst D. had burst

30. It’s no use ______ him really. He had to do what he had been told to.

A. to blame B. for blaming C. you blame D. blaming

31. Have you got a car ______?

A. of your own B. of yourself C. of you D. of your

32. I’m not accustomed ______ in public.

A. to speak B. to speaking C. speaking D. at speaking

33. Either john or his brothers ______ the key to the car.

A. has been taken B. has taken C. have takenD. have been taken

34. Just watch me, and do ______ I tell you.

A. whoever B. whenever C. however D, whatever

35. What we heard ______

A. encouraged B. was encouraging C. encouraging D. was encouraged

36. I would have met you at the bus terminal if I ______ that you ______

A. knew/were arriving B. knew/arrived

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C. had known/arrived D. had known/arriving

37. The fewer bags you take ______ trouble you will have.

A. the fewer B. the least C. the little D. the less

38. ______ where to find the key, the boy could not open the safe

A. knowing not B. knew not C. not knowing D. didn’t know

39. This house needs…………

A. to repaint B. repainted C. to be repainting D. repainting

40. They received……advice from their parents that they became successful.

A. so good B. such a good C. so good a D. such good

41. A good way to go to foreign countries is ________air.

A by B in C on D. with

42. All her family came to the airport to _____ her off her trip to Australia.

A. call B get C see D. take

43. - Help! -___________.

A Just a minute B Moment C I come at once D Wait on

44. If people _________ public transport, there will be less pollution.

a. use b. will use c. can use d. used

45. Nobody knew he was coming. He arrived __________.

a. expect b. unexpected c. expectedly d. unexpectedly

46. You’ll get a cold if you _________ your warm clothes.

a. change b. don’t change c. didn’t change d. won’t change

47. I waited ______ in the waiting room before the interview.

a. nervous b. happy c. nervously d. terrible

48. Why don’t you reuse it instead ________ it?

a. to throw b. of throwing c. throwing d. of throw

49. I’m disappointed _________ people have spoiled this area.

a. that b. when c. if d. with

50. He _____ to find a job but he has no luck.

a. hardly tried b. tried hardly c. hard tried d. tried hard

V: Complete the passage.

sun, however, lasts, for, cause, used, in, of, being, but

Are you looking (1)…….a cheap, clean, effective source of power that doesn’t (2) ……

pollution or waste natural resources? Look no further than solar energy. While most fuels

now iin use are (3)…… burned at an astonishing rate, solar energy, or power from the (4)

…… , will last as long as the world (5)……. . This energy has already been (6)…… to heat

and cool homes and to cook food. It has been used experimentally (7)…… radio batteries

and in furnishing power for telephone lines. The devices, (8)……, are cheap to operate but

very expensive to produce.

VI- Choose the correct connectives in brackets:

1- I opened the door....................................................... looked out. (And / but)

2- I arrived 20 minutes early; I had time for a cup of tea. (So / because)

3- We looked everywhere. .................... , we could not find the keys. (However /

Therefore)

4- The bus fare is expensive. ........................ , I prefer to walk. (However / Therefore)

5- There were many people at the concert, we couldn’t get seats.(so / however)

6- I read the book, did not understand it. (But / or)

7- We had to wait................................................. we arrived early. (Because / so)

8- I would like to go swimming. ................. , I have too much work to do.(However /

Therefore)

9- I go for a walk ................................. the sun is shining. (Because / so)

10- Do you know his address............................... ? Telephone number? (But / or)

VII: Complete each of the following sentences in such a way that means the same as

the first one

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1. Because my brother has never been abroad before, he finds this trip exciting.

- My brother.......................................................................

2. Which speed did he drive at on the high way last night?

How.............................................. ..................... ?

3. I consider that to manage to know what other people are thinking is quite impossible.

I find it............................................... .............

4. It would be a good idea to take more exercise.

He advised me..............................................

5. I don't have a bigger problem than pronunciation.

My............................................... .....................................

6. Green Peace will organize a meeting at the Town Hall next Tuesday.

There will be............................................... .............

7. I can't describe people as well as you can.

You’re............................................... ..................................

8. I didn't arrive in time too see her.

I wasn't early............................................ .............

9. He failed to win the race.

He didn’t................................................. .........................

10. You may get hungry on the train, so take some sandwiches.

- In case...........................................................................................................

UNIT 7. SAVING ENERGY

TEST 4

I. Choose the word in each group that has the underlined part pronounced differently

from the rest.

1 . A. stopped B. weighed C. used D. climbed

2. A. entrance B. paddy C. bamboo D. banyan

3. A. grow B. open C. office D. moment

4. A. dormitory B. forward C. organization D. information

5. A. campus B. program C. exam D. parent

6. A. plough B. mountain C. south D. countryside

7. A. invite B. river C. shrine D. primary

8. A. behave B. medal C. refine D. rewrite

9. A. receive B. replace C. regularly D. reduce

10. A. label B. slavery C. late D. last

II. Choose the words that has a different stress pattern from the others.

1. A. garden B. ago C. youngest D. standard

2. A remain B. college C. quality D. scholar

3. A. occasion B. religion C. federation D. collection

4. A. economic B. encourage C. embroider D. experience

5. A. puppet B. unique C. tunic D. notice

III. Choose the best answer to complete these following sentences.

1. My classmates suggested playing chess but I prefer ________ hike and seek.

A. playing B. play C. played D to playing

2. You don’t like English food. What about ________Chinese food?

A. to eat B. eat C. eating D. ate

3. I think we should ________ up our neighborhood.

A. to clean B. clean C. cleaning D. cleaned

4. Our teacher suggests ________a meeting to discuss about the solution to keep our

environment clean.

A. to hold B. hold C. holding D. held

5. Her former leader suggests that she should ________ harder to break her past records.

A. to train B. train C. training D. trained

6. The children volunteer to clean up the local park ________ there are lot of used cans and

trash there.

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

7. Her mother took her to the zoo ________ it owed her some rare animals.

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

8. The “Green Sunday” was short: ________, the students enjoyed it very much.

A. but B. because C. however D. although

9. Hoa missed the bus this morning, ________ she went to school late.

A. but B. so C. however D. and

10. Dioxins are dangerous chemicals________ they can cause cancer and birth defects.

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

11. The children ate too much sweet ________ they get toothache easily.

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

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12. Organically grown fruits and vegetables may not look as perfect, ________ it’s good for

your health.

A. so B. and C. however D. therefor

13. Thousand s of gallons of water were polluted ________some body spilled the motor oil

and it swept into the ground.

A. because B. so C. and D. however

14. ________ we use less electricity, power plants will burn less fuel.

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

15. Old newspapers can be used to make newspapers, ________ you can collect them and

bring them to the recycling center.

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

16. Don’t use Styrofoam or aerosol spray ________ they both contain chlorofluorocarbons.

A. so B. because C. and

17. Pesticides are chemicals poisons used by farmers to kill weeds and insect pests,

________ some pesticides are still in the food when it gets to the market.

A. so B. because C. and D. however

18. We use paper whenever we can, ________ the backs of envelopes or the clean backs of

notebook sheets are great for scrap paper.

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

18. He didn’t go to school yesterday; ______.he had to ask his friends what they learned

then.

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

20. The countryside is very peaceful ________ the air is so fresh.

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

21. Ba missed the Math test yesterday. ________, he will have to do it next week.

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

22. My sister is very tired: ________, she still has to cook dinner for the family.

A. so B. however C. and D. as

23. She doesn’t look so pretty ________.She has soft voice.

A. and B. but C. so D. however

24. They don’t like the opera ________ it doesn’t look sound interesting.

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

25. Daisy is very nice: ________, all her friends love her very much.

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

26. Can you turn_________ the lights? It’s too dark.

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

27. What are you looking ________? My picture book. I’ve lost it.

A. on B. off C. for D. after

28. There are ________ saving methods and inventions to use solar energy.

A. energetic B. energize C. energy D. power

29. I had to pay much money this month for the international________.

A. calls B. calling C. to call D. called

30. A new – conditioner will be ________ this morning.

A. to install B. installed C. installing D. to install.

31. Scientists are looking for an ________ way to educe energy consumption.

A. effect B. affection C. effective D. effectively

32. We can ________ easily in the daylight.

A. to read B. reading C. read D. readable

33. She won’t take all these suitcases ________ she likes to travel lightly

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

34. They are completely short of water now. A number of people have died because of this

___

A. shortage B. short C. shorten D. shortening

35. What can we do to spend less ________ lighting?

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

36. There will be a _______cut tomorrow in Bu Nho.

A. energetic B. energize C. energy D. power

37. Your house needs _________ right now it’s too old.

A. paint B. painted C. to paint D. painting

38. My father used to make me ________hard at night.

A. study B. to study C. studying D, studied

39. Will you _________for dinner one night.

A. across B. down C. over D. in

40. It is necessary that the government ________something about it immediately.

A. do B. did C. to do D. have done

41. He talks as if he_________ about it clearly.

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

42. She _______ hard last night. She did her test perfectly this morning.

A. can have studied B. might have studied

C. should have studied D. must have studied

43. That’s the _______ interesting novel I’ve ever read.

A. more B. even C. most D. every

44. My color TV, _______ I bought 10 years ago, still gives beautiful pictures.

A. which B. that C. what D. X

45. He is very stubborn, so it will be difficult to _______ him to go.

A. persuade B. suggest C. make D. prevent

46. “Who is Mr. Medley?” “I have no idea. I’ve never heard _______ him”.

A. about B. from C. after D. of

47. Children are _______ to overcome problems.

A. determine B. determined C. determinant D. determination

48. They will be sent to work in America _______ their English is better next year.

A. when B. unless C. if D. because

49. I’ve never ______very well with my brother. We’ve got completely different personalities.

A. got off B. got on C. got away D. got up

50. ____ lion dancing is very popular in Viet Nam, my friend Andy does not enjoy it.

A. But B. Although C. If D. However

IV. Complete the conversations with expressions for suggestion.

1. A: I like having seafood for dinner.

B : ______________ go to the restaurant by the seaside?

2. A: I’m really tired.

B : I’m tired too. ______________ resting for a while?

3. A: ______________ travel around the town?

B : That’s a good idea. ______________ hiring a motorcycle. We’ll see a lot more that

way.

4. A: I want to buy some souvenirs before we leave.

B : OK. ______________ go shopping after dinner.

5. A: What should I do to save electricity?

B : I ______________ turn on a lot of lights and remember to turn off television before

going to bed.

6. A: It’s a lovely day. ______________ go for a picnic?

B : No. I don’t want to. ______________ playing tennis.

V. Use the words given in the box to fill in the blanks to make a meaningful passage.

There is one extra word that you don’t need to use:

recycling/ nothing/ list/ vegetables/ something/ save/ trouble/ polluting/ taking.

Our environment is in (1) ______. Modern ways of living and today’s industries are (2)

______ it. Most people think there is (3) ______ they can do. This is not true. Everyone can

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do something to help (4) ______ our environment. Here is a (5) ______ of things you can

do.

- Help to cut pollution by (6) ______ the bus to work instead of your car.

- Buy fruit and (7) ______ that have not been treated with pesticides.

- Recycle all your cans, bottles and paper. There should be a (8) ______ center

somewhere near your home, so take them there.

Most of the world’s energy comes from the sun. The sun’s energy is in wood, oil, and

other things that people use for energy.

VI. Read the text then answer true or false

People use many sources of energy. Ancient people used only their arms, hands, and

simple tools until they discovered fire. Later, people learned to use the energy of the wind to

sail ships. Then they learned to use animals to do work. In the eighteenth and nineteenth

centuries, people began to use machines. The first machines used steam. They burned coal

to heat water. The hot water turned into steam, and the steam engine did the work. Later,

people began to use the gasoline engine, and today people are using nuclear energy.

Energy is one of the basic concepts, or ideas, of physics. It is the ability to do work.

Without energy we could live. We need energy to work, and scientists are always looking for

new sources of energy.

1. None of the world’s energy comes from the sun.

2. Wind, steam, and gasoline are sources of energy.

3. People have never used nuclear energy.

4. Energy is the ability to do work.

5. We need new sources of energy.

VII: Complete each of the following sentences in such a way that means the same as

the first one

1. Mary no longer prepares for the wedding parties

à Mary doesn't.......................................... ......................................................................

2. Who owns this motorcycle?

à Who does....................................................................................................................... ?

3. How long have John and Mary been married?

à When did................................................. ......................................................................

4. Remember to check for spelling mistakes before you hand in your composition.

à Don’t................................................. ............................................................................

5. The sea was too rough for the children to go swimming

à The children.....................................................................................................................

6. Mary rang hours and hours.

à It is................................................. ..................................................................................

7. He failed to win the race.

à He didn't.......................................................................................................... ................

8. It was only when I looked the room that I realized I hadn't turned off the cooker.

à Not until................................................. .........................................................................

9.You know a bit about cars but I know more.

à You don’t...................................................................................................................... ..

10. The rain began to fall during my walk in the country.

à While................................................................................................................................

VIII: Use the correct form of the words in the brackets to complete the following

sentences.

1. The man could give no........ for his violent behavior. (EXPLAIN)

2. Although her visit was ........ , we made her welcome just the same. (EXPECT)

3. I know all the boys who live in my............... (NEIGHBOUR)

4. He does not agree with the.....that there is life on other planets. (BELIEVE)

5. He examined the parcel......, as he had no idea what it could be. (SUSPECT)

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6. All the courses ....... in January will finish in June. (BEGIN)

7. A letter should always end with the ...... of the writer. (SIGN)

8. It is really quite.....that we should have been at the same college without having met before

(ORDINARY)

9. There is a great.....between Hari and his twin brother. (SIMILAR)

10. With a good.... of the criminal from witnesses, the police were able to find him easily.

(DESCRIBE

UNIT 7 SAVING ENERGY

TEST 3

I. Choose the word in each group that has the underlined part pronounced differently

from the rest.

1. A. dump B. junkyard C. pollute D. adult

2. A. changes B. aches C. washes D. oranges

3. A. lakes B. roofs C. steps D. taxis

4. A. walked B. practised C. pleased D. missed

5. A. wicked B. needed C. learned D. collected

6. A. pages B. tops C. necks D. this

7. A. played B . cooked C. talked D. laughed

8. A. watches B. trees C. buses D. sentences

9. A. roofs B. boards C. hangs D. clothes

10. A. hanged B. earned C. noted D. cleaned

II. Choose the words that has a different stress pattern from the others.

11.A. innovation B. ultimately C. regularly D. comfortable

12. A. yourself B. English C. shopping D. speeches

13. A. birthday B. parents C. pleasant D. begin

14. A. unlikely B. writer C. attack D. suggest

15. A. impression B. remember C. character D. attention

III. Choose the best answer to complete these following sentences.

1. You can’t have both of these products. Take one __________ the other.

A. and B. with C. but D. or

2. Ba really wants to buy new tables and chairs. ___________, new furniture costs too much.

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

3. If the TV is always on in your house, you will not reduce the ________ of electricity you

use.

A. number B. amount C. much D. plenty

4. “I suggest fixing the dripping faucet.” “__________”

A. We will. B. Good idea ! C. Yes, please. D. I’m afraid not.

5. Lan spoke English _________ after she lived in England for several months.

A. nature B. natural C. naturally D. unnaturally

6. There’s nothing good on TV. Why don’t you turn it _________ ?

A. on B. down C. off D. up

7. I’m trying to cut down ____________ the amount of driving I do to save energy.

A. off B. to C. out of D. on

8. They wrote _______________ the addresses so that they could get in touch.

A. down B. out C. in D. on

9. They climbed onto the wall and they couldn’t get _______________.

A. down B. on C. in D. over

10. _______________he has been absent frequently; he has managed to pass the test.

A. Because B. Because of C. But D. Though

11. Mary will take a plane _______________ she dislikes flying.

A. even though B. because C. and D. in spite of

12. She drank it to keep herself warm _______________ she dislikes coffee.

A. although B. because C. because ofD. despite

13. The children like to put _______________ nice clothes when they go out.

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

157

14. Before you go to bed, please turn _______________ all the lights.

A. off B. on C. in D. over

15. Please turn _______________ the gas, I want to cook my lunch.

A. over B. back C. on D. in

16. I like bananas, _______________ my brother doesn’t.

A. because B. but C. and D. even though

17. I shall go _______________ you stay here.

A. and B. because C. however D. although

18. Jane will be admitted to the university _______________ she has bad grades.

A. because B. even though C. because of D. but

19. _______________ his physical handicap, he has become a successful businessman.

A. Although B. Despite C. Because of D. Because

20. She was absent _______________ her cold was worse.

A. because B. or C. because ofD. so

21. The examination was long _______________ difficult.

A. or B. and C. but D. however

22. John was ill, _______________ he went to bed early.

A. but B. so C. because of D. however

23. I’d love to play the table tennis _______________ I have to complete an assignment.

A. and B. so C. but D. or

24. He likes to travel, _______________ so does she.

A. and B. or C. but D. therefore

35. The new models are expensive, _______________ efficient.

A. however B. therefore C. and D. but

26. He failed his examination. _______________; she will have to do the examination again.

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

27. Students have to carry __________ their duties.

A. out B. in C. for D. over

28. He ate the chocolate cake _________ he is on a diet.

A. in spite of B. because C. despite D. even though

29. She attended the class __________ she didn’t feel alert.

A. because B. although C. so D. and

30. Classes will be canceled tomorrow _________ it is a national holiday.

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

31. _________ her mother’s sickness, she couldn’t attend our wedding.

A. As of B. Because of C. Because D. Since

32. It can be black, white __________ gray.

A. or B. however C. but D. so

33. Is it a boy _________ a girl?

A. and B. but C. or D. therefore

34. Internet is a very fast __________ convenient way for us to get information.

A. and B. therefore C. or D. but

35. He is going to collect all the bags _________ take them to the garbage dump.

A. or B. and C. however D. but

36. He likes her a lot. _________; he wouldn’t keep calling her.

A. and B. however C. or D. so

37. Yesterday, he gave __________ his evening job.

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

38. It was still painful, __________ I went to see a doctor.

A. but B. so C. or D. however

39. In Western countries, electricity, gas, __________ water are not luxuries but

necessarities.

A. and B. or C. but D. therefore

44. The examination tested both listening __________ reading.

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A. or B. and C. but D. however

41. It is raining, ________ I can’t go to the beach.

A. so B. but C. or D. and

42. If you _________ complaining, I’ll leave immediately.

A. go off B. go for C. go on D. go over

43. Go _________ until you get to the junction and turn left.

A. out B. on C. back D. ahead

44. He took _________ my wet boots and made me sit by the fire.

A. on B. after C. over D. off

45. May I borrow your dictionary? I want to _________ this word.

A. take up B. go up C. look up D. come up

46. Lan suggested ________to the zoo at weekend .

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

47. Shall we clean up the kitchen, Mum ? ________

A. Yes, we do B. O.K C. No, we don’t. D. Ýe, let’s

48. It ‘s so hot . Why don’t we go swimming ? ________

A. Yes, we do B. No, we don’t C. That’s a good idea. D. Yes, thanks

49. Let’s go somewhere for a drink________

A. All right B. Yes, we do C. No, we don’t . D. No, thanks

50. This movie is not interesting . How about ________ to the concert.

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

IV. Complete the sentences by using the correct form of the phrasal verbs in brackets.

1. Nobody is watching the TV. ______________________________. (turn off)

2. There is always litter here. No one ever _____________________________. (pick up)

3. ‘Do you want this box? ‘No, you can _____________________________. (throw away)

4. ‘Do you know the meaning of this word?’ ‘No, have you

____________________________ in the dictionary? (look up)

5. Shhh! The children are asleep. Don’t _____________. (wake up)

6. It’s quite cold outside. Put on your coat! Yeah, I’m ______________ right now. (put on)

7. Have you washed up the dishes? – I’m going to _____________. (wash up)

8. I haven’t heard from my sister recently. Perhaps I should ___________ now. (ring up)

9. I wanted to buy a shirt from that shop, but when I _____________, it didn’t fit me. (try on)

10. They gave me a form and told me to ___________________. (fill in)

11. It’s quite dark. There the light! Could you please __________________. (turn on)

12. Na is under the table. She ______________________ her pen. (look for)

V: Read the passage, choose True or False.

Many people still believe that natural resources will never be used up. Actually, the

world’s energy resources are limited. Nobody knows exactly how much fuel is left. However,

we also should use them economically and try to find out alternative sources of power.

According to

Professor Marvin Burnham of the New England Institute of Technology, we have to start

conserving coal, oil and gas before it is too late; and nuclear power is the only alternative.

However, many people do not approve of using nuclear power because it’s very

dangerous. What would happen if there was a serious nuclear accident? Radioactivity

causes cancer and may badly affect the future generations.

The most effective thing is that we should use natural resources as economical as

possible.

1. Natural resources will never run out.

2. We don’t know exactly how much fuel is left.

3. We shouldn’t waste fuel.

4. According to Professor Marvin Burnham, solar energy will be used as a substitute for

natural resources.

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5. All people agree to use nuclear power as an alternative energy.

6. Radioactivity from nuclear power causes cancer and may have bad effect on the future

generations.

7. Natural resources should be used as much as possible.

4. My family used to be having dinner at 7 o’clock in the evening

5. I wish I can go with you to the countryside next weekend

VI. Read each of these sentences then try to find the mistake and correct it.

1. How about having dinner and then go to the theater?

2. It’s possible store solar energy for a number of days.

3. Our environment has become worse but there are many factors causing from men.

4. My recent electricity is enormous so I’m worried in it.

5. She turned on her radio at the lowest in order not to disturb the others at night.

6. What about put rubbish bins around the schoolyard?

7. The streets are wide enough for cars to move easy between lanes.

8. Our world will be better if people will care about what they do.

9. If we work harder, we won’t finish it on time.

10. The earth is much hotter so people don’t know the way to protect it.

VII. Give right word formation of these following words

1.Will you please give us some ……………..……..explanation? (far)

2.You should…………………...yourselves with the new environment.(family)

3.She likes going ……………..…….with her classmates.(picnic)

4.Are there any………………..…….between them?(similar)

5.There’re many …………….…..programs at the Festival in hue.(Culture)

6.Although some societies are………..………undeveloped, their languages are very complex.

(technology)

7.It’s education that helps with the………………………of knowledge for the young (rich)

8.He likes watching……………………….programs on TV(entertain)

9.Many…………………...say that is the best method to adopt(science)

10.Esperanto,however,proves to be useless because it’s………………..………(popular)

VIII. Choose the best option to fill each of the blanks to make a meaningful passage:

Most people think of computers as very modern inventions, products of our new

technological age. But actually the idea for a computer was (1) _______ out over two

centuries ago by a man (2) _______ Charles Babbage.

Babbage was born in 1791 and (3) _______ up to be a brilliant mathematician. He

drew up plans for several calculating machines (4) _______ he called “engines”. But despite

the fact that he (5) _______ building some of these he never finished any of them. Over the

years people have argued (6) _______ his machines would ever work. Recently, however,

the Science Museum in London has finished building (7) _______ engine (8) _______ on one

of Babbage’s. designs.

It has taken six years to complete and more (9) _______ four thousand parts have

been specially made. Whether it works or not, the machine will be on show at a special

exhibition in the Science Museum to (10) _______ people of Babbage’s work.

1. A. turned B. thought C. invented D. worked

2. A. known B. recognized C. called D. written

3. A. developed B. grew C. brought D. expected

4. A. which B. who C. there D. whose

5. A. wanted B. made C. started D. missed

6. A. until B. whether C. while D. though

7. A. an B. the C. some D. that

8. A. depended B. based C. insisted D. influenced

9. A. than B. therefore C. when D. then

10. A. remind B. say C. inform D. encourage

VIII: Complete each of the following sentences in such a way that means the same as

the first one

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1. If people (continue) ___________ to throw trash onto the water, it (not be)

____________resh enough to use.

2. If the weather (be) _______________ fine, we (go) ______________ on our picnic.

3. You (not finish) ________________ your work if you (be) ________________ lazy.

4. If people (use)__________ public transport, there (be) ___________ less pollution.

5. If it (be)_____________ raining this evening, I (not go)_____________.

cho (O) đường kính AD=R. Gọi I là trung điểm OD. Qua I kẻ dây BC vuông góc AD

a) CM tam giác ABC là tam giác đều

b) Tính độ dài các cạnh của tam giác ABC theo R