7. If the factory continues dumping poisons into the lake, all the fish and other ________

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Manjito Sano

9 tháng 1 2022 lúc 16:43

7. If the factory continues dumping poisons into the lake, all the fish and other _________ animals will die. A. aquatics B. aquatic C. aquatical D. aquatically 8. He is _________ a lot because it is cold. A. sneezes B. sneeze C. sneezed D. sneezing 9. Don’t drink that water! It’s __________.A. contaminated B. contamination C. contaminant D. contaminating 10. A huge amount of _________ chemical waste is dumped into the lake. A. pois...

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7. If the factory continues dumping poisons into the lake, all the fish and other _________ animals will die.

A. aquatics B. aquatic C. aquatical D. aquatically

8. He is _________ a lot because it is cold.

A. sneezes B. sneeze C. sneezed D. sneezing

9. Don’t drink that water! It’s __________.

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

10. A huge amount of _________ chemical waste is dumped into the lake.

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

11. The crop was severely ________ by the acid rain.

A. damaged B. poisoned C. polluted D. contaminated

12. Many people _________ litter on the streets.

A. pay B. give C. catch D. throw

13. When _________ pollution happens, the water temperature in streams, rivers and lakes, or oceans changes.

A. water B. thermal C. temperature D. heat

14. The sight of too many telephones poles, advertising billboards, overhead power lines, or shop signs may cause _______.

A. light pollution B. air pollution C. visual pollution D. sight pollution

15. Many children around the world are suffering from birth defects because their parents are _________ to radiation.

A. worked B. exposed C. expressed D. supposed

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Lớp 8 Tiếng anh

thanh tú

24 tháng 2 2022 lúc 20:05

II. Choose A, B, C or D to complete the sentences. 1. If this factory continues poison into the lake, all the fish will die.A. pouring B. dumping C. pumping D. sacking2. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans …………..A. changes B. keeps C. remains D. stays3. The sight of too many advertising billboards overhead poles and shop signs causes …………..pollution.A. air ...

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

1. If this factory continues poison into the lake, all the fish will die.

A. pouring B. dumping C. pumping D. sacking

2. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans …………..

A. changes B. keeps C. remains D. stays

3. The sight of too many advertising billboards overhead poles and shop signs causes …………..pollution.

A. air B. light C. noise D. visual

4……………… you ever been to any English speaking countries?

A. Do B. Have C. Were D. Are

5. Australia is home to………………….. animals like kangaroos and koalas

A. only B. rare C. unique D. precious

6. Singapore is famous for its..............................and green trees.

A. cleanliness B. cleanly C. cleaning D. clean

7. On Christmas Eve, most big cities, especially London are ............................... with colored lights across the streets and enormous Christmas trees.

A. decorated B. hang C. put D. made

8. In the United States there are 50 .......... and six different time zones across the country

A. states B. nations C. towns D. countries

9. I once tried to …………… apple pie when I was in London. It was really delicious.

A. do B. cook C. make D. show

10. You should go to Canada in summer because it is the most popular time for visitors to ………………… Niagara Falls and see the beautiful sights there.

A. stay B. look C. tour D. visit

11. Nowadays you still see the ………………… men where kilts (skirts) to wedding or other formal occasions.

A. Scottish B. Scotland C. Scots D. Scot

12. The USA has a population of about 304 million, and it is the third ………………… country in the world.

A. smallest B. largest C. narrowest D. highest

13. In some English speaking countries, turkey and pudding are...........food at Christmas.

A. national B. historical C. traditional D. possible

14. New Zealand ............................lovers of nature and fans of dangerous sports.

A. attracts B. keeps C. calls D. asks

15. Queenstown in New Zealand has got beautiful ………………… and a dry climate, so it's ideal for outdoor activities.

A. look B. viewing C. atmosphere D. scenery

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Lớp 8 Tiếng anh

abcxyz300

26 tháng 7 2021 lúc 10:22

I. Choose the best answer A, B, C or D to complete the sentences:1. If the factory continues dumping poison ......... the lake, all the fish and other aquatic animals will dieA. intoB. to C. about D. in2. ............ is the most common natural disaster in your country ? - Snowstorms.A. WhyB. How C. WhoD. Which3. I couldn’t sleep ............ there was a loud noise next to my door last night.A. althoughB. because SS C. soD. but4. On...

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I. Choose the best answer A, B, C or D to complete the sentences:

1. If the factory continues dumping poison ......... the lake, all the fish and other aquatic animals will die

A. intoB. to C. about D. in

2. ............ is the most common natural disaster in your country ? - Snowstorms.

A. WhyB. How C. WhoD. Which

3. I couldn’t sleep ............ there was a loud noise next to my door last night.

A. althoughB. because SS C. soD. but

4. On Christmas Eve, most big cities, especially London are..........withcoloured lights across the streets

A. decorated B. hang C. put D. made

5. American rarely shake hands to say goodbye, except ............ business occasions

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

6. When a typhoon happened , many houses and roads ............ destroyed or flooded.

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

7. Last year, there was a big typhoon in my area. It caused extensivedamage to our ......

A. wealth B. furniture C. property D. savings

8. ............. workers were sent to the area immediately but no villager was survived when the landslide happened.

A. rescue B. help C. assistance D. volunteer

9. .............is the most common natural disaster in your country?

A. WhenB. HowC. WhoD. Which

10. What .............we do to prevent these natural disasters?

A. may B. oughtC. shouldD. be able

11. All our English teachers are ________________speakers.

A. nation

B. original

C. native

D. foreign

12. Don’t drink that water. It’s ________________ .

A. contaminated

B. damaged

C. dumped

D. clean

13. The sight of too many advertising bill boards, overhead poles and shop signs causes ___________ pollution.

A. air

B. light

C. noise

D. visual

14. The heavy rain has caused ________________in many parts of the country.

A. storms

B. floods

C. drought

D. volcano

15. Australia is home to ________________animals like kangaroos and koalas.

A. only

B. rare

C. unique

D. precious

16. Nam asked Peter what he was doing ________________ .

A. now

B. ago

C. today

D. then

17. Americans rarely shake hands to say goodbye, except ____________business occasions.

A. on

B. during

C. at

D. in

18. Astronauts use ________________to move around when they are on the Moon’s surface.

A. spaceships

B. flying saucers

C. moon buggies

D. space cars

19. ________________is popularly used to enable people from different countries to have meetings. People can watch and listen to each other through a screen .

A. Chatting

B. Video conferencing

C. Emailing

D. Texting

20. ________________system use several different ways of giving information with sounds, pictures, and texts on a screen .

A. Multimedia

B. Emailing

C. Telephoning

D. Chatting

II. Supply the corect tense or form of the verb in parentheses:

1. If I (be)________you, I would think very carefully.

2. Most people (leave)________before the volcano erupted.

3. The train (arrive) ________at 6 tomorrow morning.

4. They might (be) ________in the office.

5. This time tomorrow I (chat) ________with my cousin in Sydney on Skype.

6. I (watch )________________ a science fiction film on TV at 9.00 last night.

7. My sister is fond of (make) ________________ spring rolls at Tet.

8. This test must (finish) ________________ before going to bed.

9. They (live) _____________________ in this village since last year.

10. If you use robots to do the housework, you (become) ________________lazier

III. Choose the correct word A, B, C or D for each gap to complete the following passage :

We are all slowly (1)________the Earth. The seas and rivers are too dirty to swim in. There is so much smoke in the air that it is unhealthy to live in many of the world’s cities. In one well-known city, for example, poisonous gases (2) ________cars pollute the air so much that traffic policemen have to wear oxygen masks. We have cut down (3)________trees that there are now vast areas of waterland all over the world. As a result, farmers in parts of Afica can not grow enough (4)________. In certain countries in Asia, there is too little rice. Moreover, we do not take enough care of the countryside.

Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many of them. However, it isn’t enough simply to talk about the problem. We must act now before it is too late to do (5)________about it. Join us now. Save the Earth!

1. A. destroyedB. destroyingC. destroysD. destroy

2. A. by B. fromC. ofD. in

3. A, so much B. so fewC. so littleD. so many

4. A. eatingB. to eatC. for eatD. to be eaten

5. A. anything B. nothingC. everythingD. something

IV. Read the following passage and do the tasks below:

There are more than 3,000 languages in the world today, but only about six are major languages of the world. Two-thirds of the world’s populations speak those six languages. More than 300,000,000 people speak English as their first or native language. No one knows how many people speak it as a foreign language. Chinese is the only language with more speakers than English. This is because of the huge population of China, more than one billion people.

English is the native or official language on the one-fifth of the land area of the world. It is spoken in North America, Great Britain, Australia and New Zealand. In South Africa and India it is one of the official languages.

More people study English than any other languages. In many countries, the textbook in universities are in English. Many university classes are taught in English even though the native language is not English. English is the language of international communication. It is the language of international business, research, and science. More than three-fourths of the world’s mail is written in English. More than three-fifths of the world’s radio stations use English. More than half of the scientific and research journals are in English. Most other languages have borrowed many English words.

A. Choose the best answer a, B, C or D to complete the sentences:

1. What language has the most speakers in the world?

A. EnglishB. FrenchC. ChineseD. Russian

2. ________people speak English as their first or native language.

A. Two-thirds of the world’s populationB. Over 300 million

C. About 300 millionD. nearly 300 billion

V. Rearrange the sentences using the following words:

1. On/ occasion, / this/ special/ every body/ return/ to/ wants/ to/ familes/ their.

=>…………………………………………………………………………….

2. fish/ The/ died/ because/ have/ the / water/ polluted/ of.

=>…………………………………………………………………………….

3. camp/ closes/ Our/ July 15th / on.

=>…………………………………………………………………………….

4. Science/ also/ and/ technology/ have/ effects/ enormous/ development/ on.

=>…………………………………………………………………………….

5. Sydney/ city/ is/ largest/ the/ Australia/ in/./

=>…………………………………………………………………………….

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Lớp 8 Tiếng anh

Linh Phương

23 tháng 3 2021 lúc 14:39

I. Choose the best answer A, B, C or D to complete the sentences:1. If the factory continues dumping poison ......... the lake, all the fish and other aquatic animals will dieA. into B. to C. about D. in2. ............ is the most common natural disaster in your country ? - Snowstorms.A. Why B. How C. Who D. Which3. I couldn’t sleep ............ there was a loud noise next to my door last night.A. a...

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I. Choose the best answer A, B, C or D to complete the sentences:

1. If the factory continues dumping poison ......... the lake, all the fish and other aquatic animals will die

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

2. ............ is the most common natural disaster in your country ? - Snowstorms.

A. Why B. How C. Who D. Which

3. I couldn’t sleep ............ there was a loud noise next to my door last night.

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

4. On Christmas Eve, most big cities, especially London are..........with coloured lights across the streets

A. decorated B. hang C. put D. made

5. American rarely shake hands to say goodbye, except ............ business occasions

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

6. When a typhoon happened , many houses and roads ............ destroyed or flooded.

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

7. Last year, there was a big typhoon in my area. It caused extensive damage to our ......

A. wealth B. furniture C. property D. savings

8. ............. workers were sent to the area immediately but no villager was survived when the landslide happened.

A. rescue B. help C. assistance D. volunteer

9. .............is the most common natural disaster in your country?

A. When B. How C. Who D. Which

10. What .............we do to prevent these natural disasters?

A. may B. ought C. should D. be able

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Lớp 8 Tiếng anh

Lê Quyên

9 tháng 2 2022 lúc 22:14

I. Choose the best answer A, B, C or D to complete the sentences:1. If the factory continues dumping poison.... the lake, all the fish and other aquatic animals will dieA. into B. to C. about D. in2. ............ is the most common natural disaster in your country ? - Snowstorms.A. Why B. How C. Who D. Which3. I couldn’t sleep ............ there was a loud n...

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I. Choose the best answer A, B, C or D to complete the sentences:

1. If the factory continues dumping poison.... the lake, all the fish and other aquatic animals will die

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

2. ............ is the most common natural disaster in your country ? - Snowstorms.

A. Why B. How C. Who D. Which

3. I couldn’t sleep ............ there was a loud noise next to my door last night.

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

4. On Christmas Eve, most big cities, especially London are..........with coloured lights across the streets

A. decorated B. hang C. put D. made

5. American rarely shake hands to say goodbye, except ............ business occasions

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

6. When a typhoon happened , many houses and roads ............ destroyed or flooded.

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

7. Last year, there was a big typhoon in my area. It caused extensive damage to our ......

A. wealth B. furniture C. property D. savings

8. ............. workers were sent to the area immediately but no villager was survived when the landslide happened.

A. rescue B. help C. assistance D. volunteer

9. .............is the most common natural disaster in your country?

A. When B. How C. Who D. Which

10. What .............we do to prevent these natural disasters?

A. may B. ought C. should D. be able

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Lớp 8 Tiếng anh

Lê Quyên

9 tháng 2 2022 lúc 22:07

I. Choose the best answer A, B, C or D to complete the sentences:1. If the factory continues dumping poison.... the lake, all the fish and other aquatic animals will dieA. into B. to C. about D. in2. ............ is the most common natural disaster in your country ? - Snowstorms.A. Why B. How C. Who D. Which3. I couldn’t sleep ............ there was a loud n...

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I. Choose the best answer A, B, C or D to complete the sentences:

1. If the factory continues dumping poison.... the lake, all the fish and other aquatic animals will die

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

2. ............ is the most common natural disaster in your country ? - Snowstorms.

A. Why B. How C. Who D. Which

3. I couldn’t sleep ............ there was a loud noise next to my door last night.

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

4. On Christmas Eve, most big cities, especially London are..........with coloured lights across the streets

A. decorated B. hang C. put D. made

5. American rarely shake hands to say goodbye, except ............ business occasions

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

6. When a typhoon happened , many houses and roads ............ destroyed or flooded.

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

7. Last year, there was a big typhoon in my area. It caused extensive damage to our ......

A. wealth B. furniture C. property D. savings

8. ............. workers were sent to the area immediately but no villager was survived when the landslide happened.

A. rescue B. help C. assistance D. volunteer

9. .............is the most common natural disaster in your country?

A. When B. How C. Who D. Which

10. What .............we do to prevent these natural disasters?

A. may B. ought C. should D. be able

II. Supply the corect tense or form of the verb in parentheses:

1. If I (be)________you, I would think very carefully.

2. Most people (leave)________before the volcano erupted.

3. The train (arrive) ________at 6 tomorrow morning.

4. They might (be) ________in the office.

5. This time tomorrow I (chat) ________with my cousin in Sydney on Skype.

PART C : READING

I. Read the following passage and put a word in each of the blanks:

Scotland is in the north of Great Britain. It is (1)________for its rich culture as well as its amazing natural beauty. (2)________to this land can spend endless days exploring its historic centuries-old castles. But be aware- legend says that some of them are haunted by ghosts. Fun-lovers can (3)________its world-famous festival, the Highland Games where they can enjoy unique Scotish activities such as the pipping, drumming and (4) ________. They can also see traditional sports, or drink whisky with the (5)________people. Driving through vast green pastures, or boating on scenic lakes- or lochs- are other attractions that Scotland offers.

1__________2__________3__________4__________5__________

II. Choose the correct word A, B, C or D for each gap to complete the following passage :

We are all slowly (1)________the Earth. The seas and rivers are too dirty to swim in. There is so much smoke in the air that it is unhealthy to live in many of the world’s cities. In one well-known city, for example, poisonous gases (2) ________cars pollute the air so much that traffic policemen have to wear oxygen masks. We have cut down (3)________trees that there are now vast areas of waterland all over the world. As a result, farmers in parts of Afica can not grow enough (4)________. In certain countries in Asia, there is too little rice. Moreover, we do not take enough care of the countryside.

Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many of them. However, it isn’t enough simply to talk about the problem. We must act now before it is too late to do (5)________about it. Join us now. Save the Earth!

1. A. destroyed B. destroying C. destroys D. destroy

2. A. by B. from C. of D. in

3. A, so much B. so few C. so little D. so many

4. A. eating B. to eat C. for eat D. to be eaten

5. A. anything B. nothing C. everything D. something

III. Read the following passage and do the tasks below:

There are more than 3,000 languages in the world today, but only about six are major languages of the world. Two-thirds of the world’s populations speak those six languages. More than 300,000,000 people speak English as their first or native language. No one knows how many people speak it as a foreign language. Chinese is the only language with more speakers than English. This is because of the huge population of China, more than one billion people.

English is the native or official language on the one-fifth of the land area of the world. It is spoken in North America, Great Britain, Australia and New Zealand. In South Africa and India it is one of the official languages.

More people study English than any other languages. In many countries, the textbook in universities are in English. Many university classes are taught in English even though the native language is not English. English is the language of international communication. It is the language of international business, research, and science. More than three-fourths of the world’s mail is written in English. More than three-fifths of the world’s radio stations use English. More than half of the scientific and research journals are in English. Most other languages have borrowed many English words.

A. Choose the best answer a, B, C or D to complete the sentences:

1. What language has the most speakers in the world?

A. English B. French C. Chinese D. Russian

2. ________people speak English as their first or native language.

A. Two-thirds of the world’s population B. Over 300 million

C. About 300 million D. nearly 300 billion

B. Answer the questions:

1. Are Chinese and Arabic probably major languages of the world?

……………………………………………………………………………….

2. What percent of the world’s radio stations are in English?

……………………………………………………………………………….

3. Why do some countries use English textbooks even though English is not the native language?

……………………………………………………………………………….

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Lớp 8 Tiếng anh

duy đab

22 tháng 2 2022 lúc 14:34

Choose the best answer. (A,B, C or D )1. If the factorycontinues dumping poison ________________ the lake, all the fish and other aquatic animals will die.A. into B. to C. about D. in2 Mi and Nick like ______________ back Mi’s home village on holiday.A. comes B. come C. came D. coming3. If we ______________ water carefully, more pe...

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Choose the best answer. (A,B, C or D )

1. If the factorycontinues dumping poison ________________ the lake, all the fish and other aquatic animals will die.

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

2 Mi and Nick like ______________ back Mi’s home village on holiday.

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

3. If we ______________ water carefully, more people will have fresh water.

A. will use B. would use C. using D. use

II. Use the correct form of the verb in the blank. (0.5points)

1 The Statue of Liberty in New York is a monument which ___________ (symbolize) freedom.

2. The ____________chemical waste is dumed into the river.(poison)

I. Read the passage and answer the questions.(1points)
Visual pollution has a greater effect on people than you may think. I remember when I went to a big city, I was really scared because so much graffiti on the buildings' wall. Then I looked up, and I saw a lot of power lines over my head. Although they were not dangerous, I still felt unsafe since I thought they might fall down. These things prevented me from enjoying the beautiful sights of the city.
I also remember the time when I was a student at a university. Once I was so busy with my assignments that I did not tidy my room for two weeks. Looking at the messy room caused me so much stress that I did not want to study. Then I decided to clean the room and put my thing in their proper places. I also bought a small plants and placed it in a corner of the room. These simple actions increased my motivation and helped me to focus on my learning.

Questions.

1.How did the author feel when she saw the power lines?

………………………………………………………………………………………………….

2.Why did she have that feeling?

……………………………………………………………………………………………………

3.What was she busy with?

……………………………………………………………………………………………………

4. What happened when she looked the messy room?

……………………………………………………………………………………………………

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Lớp 8 Tiếng anh

letunglam

7 tháng 3 2022 lúc 20:29

10. The __________ of lakes, rivers, oceans or underwater water pollutionA. contaminate B. contaminated C. contamination D. contaminating11. The street doesn’t look __________ because it has a lot of rubbish.A. attract B. attraction C. attracting D. attractive12. The music club made so much noise that the _________ complained to its owner.A. residency B. residents C. reside D. residers13. Are all types of pollution _________ to the health of humans and animals?A. harmful B. harm C. harming D. h...

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10. The __________ of lakes, rivers, oceans or underwater water pollution

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

11. The street doesn’t look __________ because it has a lot of rubbish.

A. attract B. attraction C. attracting D. attractive

12. The music club made so much noise that the _________ complained to its owner.

A. residency B. residents C. reside D. residers

13. Are all types of pollution _________ to the health of humans and animals?

A. harmful B. harm C. harming D. harmless

14. The _______ are concerned about the oil spills in East Sea.

A. environment B. environmental C. environments D. environmentalists

15. Dumping __________ waste into the lakes and rivers has caused serious water pollution.

A. industrial B. industry C. industrialized D. industrialization

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Lớp 8 Tiếng anh

Nguyễn Tiến Giang

1 tháng 7 2021 lúc 14:36

Nhờ mn và Đỗ Thanh Hải Ạ 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...

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Nhờ mn và Đỗ Thanh Hải Ạ 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 31. If I _____________ where she lived, I would go and see her. A. know B. knows C. to know D. knew 32. We need to be more _____________ about this problem. A. scientific B. majestic C. domestic D. alphabetic 33. The election campaign has been focused mainly on _____________ issues. A. dialectical B. energetic C. domestic D. conical 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 37. She was unable to find a _____________ job. A. important B. importantly C. permanent D. permanently 38. Any company found to be breaking these rules will be heavily _____________. A. fined B. done C. made D. got 39. These figures are for _____________ purposes only. A. illustrate B. illustrating C. illustrative D. illustration 40. I would go jogging with Mark if he _____________ here today. A. is B. will be C. were D. would be 41. Many species of wildlife are becoming extinct, _____________ the rainforests are being destroyed. A. therefore B. since C. consequently D. so 42. Hemp can be used to make paper, _____________ it could reduce the need for logging. A. consequently B. due to C. so D. since 43. _____________ logging provides jobs and profits, the government is reluctant to control it. A . So B. Consequently C. Since D. Due to 44. Hemp was grown throughout history_____________ its versatility; it can be used to make many different things. A. due to B. because C. since D. as a result 45. Hemp is related to the marijuana plant; _____________ it is illegal in many countries. A. so B. due to C. as a result D. because 46. The polluted chemical waste was dumped into the ocean; _____________,the mass of fish died. A. because B. as C. because of D. consequently 47. It was guessed that the fish died_____________ a powerful toxin in the sea water. A. because of B. because C. since D. as a result 48. Many species in BC are threatened _____________ logging. A. so B. because C. since D. due to 49. Smoking can_____________ heart disease. A. lead to B. create C. causes D. due to 50. Radioactive pollution is increasing _____________ the increased use of radioactivity. A. as B. since C. because of D. because

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Lớp 8 Tiếng anh

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)

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Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)