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III. Choose A, B, C, D for each gap in to the following sentences.
1. Air___________, together with littering, is causing many problems in our cities today.
A. pollute B. pollution C. polluting D. polluted
2. The road in front of my office is always __________ when it rains heavily.
A. to flood B. flooding C. flood D. flooded
3. Singapore is famous for its __________ and green trees.
A. cleanliness B. cleanly C. cleaning D. clean
4. In some English speaking countries, turkey and pudding are ___________ food at Christmas.
A. national B. historical C. traditional D. possible
5. The USA has a population of 304 million, and it’s the third_________ country in the world.
A. smallest B. largest C. narrowest D. highest
6. The roof of the building _____________ in a storm a few days ago.
A. damaged B. was damaged C. has damaged D. has been damaged
7. A severe tropical___________ is called a typhoon.
A. drought B. rain C. flood D. storm
8. As soon as the floodwater ___________ down, people ____________ their houses.
A. went - cleaned B. had gone – cleaned C. went - had cleaned D. had gone – had cleaned
9. If I were you, I … do something to prevent him from littering.
A. would B. did C. will D. do
10.Earth … by the gravity of the Sun and orbits around it.
A. holds B. is held C. is holding D. held
11. By the time we … to the cinema, the film had started.
A. gets B. had got C. has got D. got
12. When the policeman came there, the robber …
A. had left B. has left C. left D. was left
13. All people who were without homes in the flood were provided with … accommodation.
A. short B. temporary C. present D. instant
14. Seven of ten people prefer face-to-face … when having a date.
A. language B. contact C. code D. sign
15. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans ... .
A. changes B. keeps C. remains D. stays
16. Australia is home to … animals like kangaroos and koalas.
A. only B. rare C. unique D. precious
17. If you were the president, what … you do to help the environment?
A. will B. did C. would D. do
18.The Maori in New Zealand greet each other by … their noses.
A. touching B. punching C. blowing D. rubbing
19. The village’s drinking water … with poisonous chemicals since the factory came into operation.
A. contaminates B. is contaminated C. has contaminated D. has been contaminated
20. When the policeman came to the scene, the driver of the car …
A. have left B. had left C. leaves D. was left
21. All people who were without homes in the flood were provided with … accommodation.
A. short B. temporary C. present D. instant
22. I believe that our new manager has the … to work well in this business environment.
A. inflexible B. flexibly C. flexibility D. flexible
23. If the factory … dumping poison into the lake, all the fish and other aquatic animals will die.
A. continues B. continued C. will continue D. continue
24. You will recognize Jenny when you see her. She … a red hat.
A. wears B. is wearing C. will wear D. will be wearing
25. the famer rides the buffalo____carts loaded full of rice home
A. draw B.drawing C.drew D.drawn
26. Little Pascal ……a mechanical calculator which could do additions or subtractions very quickly.
A. discovered B. found C. found out D. invented
27. Robots save workers from ………dangerous tasks.
A. making B. having C. performing D. carrying
28. Many people believe that robots have made workers jobless………that is not necessarily true.
A. but B. and C. so D. or
29. Recent ………developments have made robots more user-friendly and intelligent.
A. science B. scientist C. scientific D. scientifically
30. Teenagers spend most of their time playing computer games, ………they lost their interests in daily activities.
A. moreover B. so C. however D. as a result
31. Science and technology have ………the life safe, secure and comfortable.
A. transformed B. made C. done D. changed
32. The teacher __________ me that I had better devote more time to science subjects such as physics, chemistry, and biology.
A. said B. talked C. spoke D. told
33. Science is used in all corners of the world for the __________ of people.
A. interest B. need C. profits D. benefit
34. If you __________ something, you should patent it as quickly as possible.
A. invented B. will invent C. have invented D. are inventing
35. Sciences and technology have enormous ______________ on economic development.
A. affects B. effects C. affect D. effect
#Yumi
II. Find the word which has different stress pattern from the others
1. A. person B. father C. teacher D. enjoy
2. A. prefer B. enjoy C. mother D. agree
3. A. doctor B. father C. picture D. fancy
4. A. pollution B. visit C. listen D. open
5. A. depend B. advise C. affect D. listen
6. A. affect B. father C. teacher D. picture
7. A. prefer B. enjoy C. mother D. affect
8. A. affect B. happen C. pollution D. fancy
9. A. pollution B. picture C. village D. factory
10 .A. illustrate B. believe C. affect D. village
11. A. artistic B. historic C. dramatic D. scientific
12. A. medical B. national C. chemical D. historical
13. A. athletic B. dramatic C. scientific D. heroic
14 .A. medical B. hospital C. politic D. electric
15. A. chemical B. physical C. environmental D. medical
III. Choose A, B, C, D for each gap in to the following sentences.
1. Air___________, together with littering, is causing many problems in our cities today.
A. pollute B. pollution C. polluting D. polluted
2. The road in front of my office is always __________ when it rains heavily.
A. to flood B. flooding C. flood D. flooded
3. Singapore is famous for its __________ and green trees.
A. cleanliness B. cleanly C. cleaning D. clean
4. In some English speaking countries, turkey and pudding are ___________ food at Christmas.
A. national B. historical C. traditiona l D. possible
5. The USA has a population of 304 million, and it’s the third_________ country in the world.
A. smallest B. largest C. narrowest D. highest
6. The roof of the building _____________ in a storm a few days ago.
A. damaged B. was damaged C. has damaged D. has been damaged
7. A severe tropical___________ is called a typhoon.
A. drought B. rain C. flood D. storm
8. As soon as the floodwater ___________ down, people ____________ their houses.
A. went - cleaned B. had gone – cleaned C . went - had cleaned D. had gone – had cleaned
9. If I were you, I … do something to prevent him from littering.
A . would B. did C. will D. do
10.Earth … by the gravity of the Sun and orbits around it.
A. holds B. is held C . is holding D. held
11. By the time we … to the cinema, the film had started.
A. gets B. had got C. has got D. got
12. When the policeman came there, the robber …
A. had left B. has left C. left D. was left
13. All people who were without homes in the flood were provided with … accommodation.
A. short B. temporary C. present D. instant
14. Seven of ten people prefer face-to-face … when having a date.
A. language B. contact C. code D. sign
15. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans ... .
A. changes B. keeps C. remains D. stays
16. Australia is home to … animals like kangaroos and koalas.
A. only B. rare C. unique D. precious
17. If you were the president, what … you do to help the environment?
A. will B. did C. would D. do
18.The Maori in New Zealand greet each other by … their noses.
A. touching B. punching C. blowing D. rubbing
19. The village’s drinking water … with poisonous chemicals since the factory came into operation.
A. contaminates B. is contaminated C. has contaminated D. has been contaminated
20. When the policeman came to the scene, the driver of the car …
A. have left B. had left C. leaves D. was left
21. All people who were without homes in the flood were provided with … accommodation.
A. short B. temporary C. present D. instant
22. I believe that our new manager has the … to work well in this business environment.
A. inflexible B. flexibly C. flexibility D. flexible
23. If the factory … dumping poison into the lake, all the fish and other aquatic animals will die.
A. continues B. continued C. will continue D. continue
24. You will recognize Jenny when you see her. She … a red hat.
A. wears B. is wearing C. will wear D. will be wearing
25. the famer rides the buffalo____carts loaded full of rice home
A. draw B.drawing C.drew D.drawn
26. Little Pascal ……a mechanical calculator which could do additions or subtractions very quickly.
A. discovered B. found C. found out D. invented
27. Robots save workers from ………dangerous tasks.
A. making B. having C. performing D. carrying
28. Many people believe that robots have made workers jobless………that is not necessarily true.
A. but B. and C. so D. or
29. Recent ………developments have made robots more user-friendly and intelligent.
A. science B. scientist C. scientific D. scientifically
30. Teenagers spend most of their time playing computer games, ………they lost their interests in daily activities.
A. moreover B. so C. however D. as a result
31. Science and technology have ………the life safe, secure and comfortable.
A. transformed B. made C. done D. changed
32. The teacher __________ me that I had better devote more time to science subjects such as physics, chemistry, and biology.
A. said B. talked C. spoke D. told
33. Science is used in all corners of the world for the __________ of people.
A. interest B. need C. profits D. benefit
34. If you __________ something, you should patent it as quickly as possible.
A. invented B. will invent C. have invented D. are inventing
35. Sciences and technology have enormous ______________ on economic development.
A. affects B. effects C. affect D. effect
Question I. Choose the best answer. (A,B, C or D )
1. I like ______________ back my home village on holiday.
A. comes B. come C . came D. coming
2. If the factory ________________ dumping poison into the lake, all the fish and other aquatic animals will die.
A. continues B. to continue C. continued D. will continue
3.Water ________________ in the lake has made the fish die.
A. pollution B. pollute C. polluted D. polluting
4. Mi and Nick like ______________ back Mi’s home village on holiday.
A. comes B. come C. came D. coming
5. If the factory continues dumping poison into the lake, all the fish and other aquatic animals ________________.
A. die B. to die C. dead D. will die
6. Water pollution is the ________________ in the lake has made the fish die.
A. contaminating B. contaminate C. contaminated D. contamination
7. If we ______________ water carefully, more people will have fresh water.
A. will use B. would use C. using D. use
8. 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
Question 2 : Circle the word whose underlined part is pronounced differently from the others’.
1. A. linguistic B. classical C. romantic
2. A. referee B. guarantee C . jubilee
3. A. oceanic B. specific C. aquatic
4. A. payee B. coffee C. trainee
Question 3: Choose the best option to complete each sentence. Circle A, B or C.
1. The old tradition of first- footing is still practiced today in ……. .
A. Scottish B. Scots C. Scotland
2. The Maori in New Zealand greet each other by …… their noses.
A. punching B. touching C. blowing
3. I’m learning English to join an ……. summer camp.
A. nation B. natural C. national
4. In Canada, the serving of coffee at the end of an evening is a signal that it is time for ……. to prepare to leave.
A. visitors B. tourists C. holidays- makers
Question 3: Complete each sentence with the correct form of the word given.
1. Hoa has made lots of …improvement…. in her learning English. (improve)
2. Singlish is an …abbreviation…. of Singaporean English. (abbreviate)
Exercise 4: Choose the best answer:
. If I ……….a lot of money now, I …………..a new car.
A. have /will buy B. have / would buy C. had/ will buy D. had/ would buy.
1. If I ……………you, I …………….do that.
A. am/ will B. were /would C. were/ will D. had been/ would.
2. if I were offered the job, I think I ………. it.
A. take B. will take C. would take D. would have taken.
3. I would be very surprised if he……………..
A. refuses B. refused C. had refused D. would refuse.
4. Many people would be out of work if that factory………..down.
A. closes B. had closed C. closed D. would close.
5. If she sold her car, she ………… much money.
A. gets b. would get c. will get d. would have got.
6. They would be disappointed if we…………….
a. hadn’t come b. wouldn’t come c. don’t come d. didn’t come.
7. Would John be angry if I ……. ……his bicycle without asking?
a. take b. took c. had taken d. would take.
8. She ……….terrible upset if I lost this ring.
a. will be b. would be c. were d. had been.
9. If someone…………in here with a gun, I would be very frightened.
a. would walk b. walks c. had walked d. walked.
10. What would happen if you ……………..to work tomorrow?
a. don’t go b. didn’t go c. won’t go d. wouldn’t go.
11. We ‘ll get wet if we ………….out.
a. go b. did go c. went d. had gone.
12. If I go shopping, I ………some food.
a. buy b. will buy c. would buy d. would have bought.
TEST 4-UNIT 8
I. Pronunciation
1). Choose the word which has a different sound in the part underlined.
1.A. thankful B. there C. thermal D. thorough
2. A. growth B. show C. crown D. know
3. A. display B. dirty C. invent D. investigate
2). Choose the word which has a different stress pattern from the others.
4. A. historic B. physical C. aquatic D. botanical
II. Choose A, B, C, D for each gap in the following sentences.
1Many fish in my lake have died because of the ………… water
A. pollute B. pollution C. polluted D. polluting
2.My teacher always give us a clear ………..
A. explain B. explained C. explanatory D. explanation
3. You can see ………on the Canadian national flag
A. the maple leaf B. the red leaf C. the rose D. the oak tree
4.Mary is ……most beautiful of ……three sisters.
A. the/the B. a/the C. the/no article D. a/no article
5.Coal, oil and forests are the most important ……..resources
A. industrial B. agricultural C. natural D. national
6. Vy had…..stomachache because she ate a big dinner.
A. a B. an C. the D. no article
7. Have you taken notice …..the “stop” sign.
A. at B. of C. to D. from
8.The Statue of Liberty is a major monument in New York which ……..freedom
A. attracts B. symbolises C. decide D. understand
1. If I were you, I … do something to prevent him from littering.
A. would B. did C. will D. do
2.Earth ….............. by the gravity of the Sun and orbits around it.
A. holds B. is held C. is holding D. held
3. By the time we ….............. to the cinema, the film had started.
A. gets B. had got C. has got D. got
4. When the policeman came there, the robber …
A. had left B. has left C. left D. was left
5. All people who were without homes in the flood were provided with …......... accommodation.
A. short B. temporary C. present D. instant
6. Seven of ten people prefer face-to-face … when having a date.
A. language B. contact C. code D. sign
7. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans ...
A. changes B. keeps C. remains D. stays
8 Australia is home to .......................… animals like kangaroos and koalas.
A. only B. rare C. unique D. precious
17. If you were the president, what .....................… you do to help the environment?
A. will B. did C. would D. do
9.The Maori in New Zealand greet each other by .......................… their noses.
A. touching B. punching C. blowing D. rubbing
10. I believe that our new manager has the ….............. to work well in this business environment.
A. inflexible B. flexibly C. flexibility D. flexible
11. If the factory … dumping poison into the lake, all the fish and other aquatic animals will die.
A. continues B. continued C. will continue D. continue
12 You will recognize Jenny when you see her. She …....................... a red hat.
A. wears B. is wearing C. will wear D. will be wearing
13. Little Pascal ……a mechanical calculator which could do additions or subtractions very quickly.
A. discovered B. found C. found out D. invented
14. Robots save workers from ………dangerous tasks.
A. making B. having C. performing D. carrying
15. Many people believe that robots have made workers jobless………that is not necessarily true.
A. but B. and C. so D. or
16. Recent ………developments have made robots more user-friendly and intelligent.
A. science B. scientist C. scientific D. scientifically
17. Teenagers spend most of their time playing computer games, ………they lost their interests in daily activities. A. moreover B. so C. however D. as a result
18. Science and technology have ………the life safe, secure and comfortable.
A. transformed B. made C. done D. changed
19. The teacher __________ me that I had better devote more time to science subjects such as physics, chemistry, and biology.
A. said B. talked C. spoke D. told
20. Science is used in all corners of the world for the __________ of people.
A. interest B. need C. profits D. benefit
21. Sciences and technology have enormous ______________ on economic development.
A. affects B. effects C. affect D. effect
1. If I were you, I … do something to prevent him from littering.
A. would B. did C. will D. do
2.Earth ….............. by the gravity of the Sun and orbits around it.
A. holds B. is held C. is holding D. held
3. By the time we ….............. to the cinema, the film had started.
A. gets B. had got C. has got D. got
4. When the policeman came there, the robber …
A. had left B. has left C. left D. was left
5. All people who were without homes in the flood were provided with …......... accommodation.
A. short B. temporary C. present D. instant
6. Seven of ten people prefer face-to-face … when having a date.
A. language B. contact C. code D. sign
7. When thermal pollution happens, the water temperature in streams, rivers, lakes and oceans ...
A. changes B. keeps C. remains D. stays
8 Australia is home to .......................… animals like kangaroos and koalas.
A. only B. rare C. unique D. precious
17. If you were the president, what .....................… you do to help the environment?
A. will B. did C. would D. do
9.The Maori in New Zealand greet each other by .......................… their noses.
A. touching B. punching C. blowing D. rubbing
10. I believe that our new manager has the ….............. to work well in this business environment.
A. inflexible B. flexibly C. flexibility D. flexible
11. If the factory … dumping poison into the lake, all the fish and other aquatic animals will die.
A. continues B. continued C. will continue D. continue
12 You will recognize Jenny when you see her. She …....................... a red hat.
A. wears B. is wearing C. will wear D. will be wearing
13. Little Pascal ……a mechanical calculator which could do additions or subtractions very quickly.
A. discovered B. found C. found out D. invented
14. Robots save workers from ………dangerous tasks.
A. making B. having C. performing D. carrying
15. Many people believe that robots have made workers jobless………that is not necessarily true.
A. but B. and C. so D. or
16. Recent ………developments have made robots more user-friendly and intelligent.
A. science B. scientist C. scientific D. scientifically
17. Teenagers spend most of their time playing computer games, ………they lost their interests in daily activities.
A. moreover B. so C. however D. as a result
18. Science and technology have ………the life safe, secure and comfortable.
A. transformed B. made C. done D. changed
19. The teacher __________ me that I had better devote more time to science subjects such as physics, chemistry, and biology.
A. said B. talked C. spoke D. told
20. Science is used in all corners of the world for the __________ of people.
A. interest B. need C. profits D. benefit
21. Sciences and technology have enormous ______________ on economic development.
A. affects B. effects C. affect D. effect
I.
1.D.
2.D.
3.A.
4.D.
5.A.
6.A.
II.
7. The polluted water results in the death of many aquatic animals DIE
8. If we use water more careful, more people will have fresh water. CARE
9. Are all types of pollution harmful to the health of humans and animals? HARM
10. The music club made so much noise that the residents complained to its owner. RESIDE
III. Rewrite the sentences below without changing their original meaning
11. Leaves are damaged. The tree cannot get enough food energy to stay healthy. (because)
Because the leaves are damaged, the tree cannot get enough food energy to stay healthy.
12. Light pollution happens. There is a change in animals’ living patterns. (If)
If the light pollution happens, there is a change in animals’ living patterns.
13. Factories release fumes. The air breathe gets polluted. (due to)
Due to the factories release fumes. The air breathe gets polluted.
II.Choose the letter A, B, C or D the word that has different stress pattern from others.
8: A. Chinese B. coffee C. trainee D. trustee
9: A. jubilee B. absentee C. devotee D. referee
10: A. Nepalese B. addressee C. committee D. kangaroo
11: A. Maltese B. Viennese C. Chinese D. Burmese
12: A. accent B. station C. unique D. legend
13: A. puzzle B. schedule C. Scottish D. parade
14: A. official B. absolute C. koala D. committee
15: A. absolutely B. examinee C. interviewee D. Senegalese
III. Choose the letter A, B, C or D to complete the sentences.
1: It can’t be denied that English has become an __________ language of the world.
A. national B. international C. cultural D. multicultural
2: The train __________ the railway station at 8:00 a.m. every morning.
A. leave B. leaving C. will leave D. leaves
3: Koalas are well-known as the symbol __________ Australia.
A. of B. in C. on D. for
4: What he has said about me is __________ wrong.
A. absolute B. absolutely C. official D. officially
5: What is _________ official language of your country?
A. a B. an C. the D. x
6: Canada is made up _________ 10 provinces and 6 territories
A. on B. of C. by D. with
7: Since 1965, the maple tree with red leaves _________ the most well-known Canadian symbol.
A. has become B. become C. became D. becoming
8:Mount Rushmore is located _________ the USA.
A. in B. to C. of D. with
9: Trung speaks English like a native __________ though he comes from
A. speak B. speaking C. speaker D. spoke
10: English is the __________ language of many countries, including Britain and Philippines
A. official B. absolute C. unique D. puzzling
11: Australia has a wide __________ of landscapes and animal species.
A. loch B. state C. kilt D. range
12:Mount Rushmore is a national __________ carved into a mountain in South Dakota, USA.
A. schedule B. parade C. monument D. legend
13: According to the schedule, the train __________ at 12 a.m.
A. arrived B. arrive C. arrives D. arriving
14: This house is said to be __________ by ghosts.
A. haunt B. haunted C. haunting D. haunts
15: He has been working in a cattle __________ for five years
A. accent B. station C. icon D. state
IV. Choose the letter A, B, C or D to complete the sentences with given words
1:There/ many/ English/ speaking countries/ the world
A. There are many English speaking countries on the world.
B. There are many English speaking countries in the world.
C. There are many English speaking countries at the world.
D. There are many English speaking countries of the world.
2:Could/ you/ tell/ me/ what/ the symbol/ Scotland?
A. Could you tell to me what is the symbol of Scotland?
B. Could you tell to me what the symbol of Scotland is?
C. Could you tell me what is the symbol of Scotland?
D. Could you tell me what the symbol of Scotland is?
3:: Fifty stars/ the/ United States’ flag/ represent/ fifty states
A. Fifty stars in the United States’ flag represents its fifty states.
B. Fifty stars at the United States’ flag represents its fifty states.
C. Fifty stars at the United States’ flag represent its fifty states.
D. Fifty stars in the United States’ flag represent its fifty states.
4: A lot of/ people/ enjoy/ see/ ‘Titanic’/ despite/ sad ending.
A. A lot of people enjoy to see ‘Titanic’ despite its sad ending.
B. A lot of people enjoy to see ‘Titanic’ despite it has sad ending.
C. A lot of people enjoy seeing ‘Titanic’ despite it has sad ending.
D. A lot of people enjoy seeing ‘Titanic’ despite its sad ending.
5: What/ icon/ your/ country?
A. What is the icon of your country?
B. What is a icon of your country?
C. What is the icon to your country?
D. What is a icon to your country?
V. Rearrange the sentences to make meaningful sentences.
6: such/ Amsterdam/ again/ is/ it/ one/ a/ that/ to/ wonderful/ want/ city/ I/ visit/ again/ day.
A. Amsterdam is city that I want to visit such a wonderful it again one day.
B. Amsterdam is again one day such a wonderful city that I want to visit it.
C. Amsterdam is such a wonderful city that I want to visit it again one day.
D. Amsterdam is such a city wonderful that I want to visit it again one day.
7: Have/ been/ you/ New York/ ever/ to?
A. Have you ever been to New York?
B. Have you been ever to New York?
C. Have you to ever been New York?
D. Have been you ever to New York?
8: I/ to/ will/ abroad/ spoken/ learn/ English/ go
A. I will learn spoken English go to abroad.
B. I will learn spoken English to go abroad.
C. I will learn English spoken to go abroad.
D. I will spoken learn English to go abroad.
9: This/ I/ is/ have/ country/ first/ been/ the/ to/ this/ time/ country.
A. This is the first time I have been to this country.
B. This is the first this country time I have been to.
C. This is the first country I have been to this time.
D. This is I been to this the first time have country.
10: If I were rich, I would settle in Dubai
A. If were I rich, I would settle in Dubai.
B. If I would rich, I were settle in Dubai.
C. If I were rich, I would settle in Dubai.
D. If I were in Dubai, I would settle rich.
VI. Rewrite sentences without changing the meaning
11: He hasn’t got his hair cut for two months.
A. It has been two months since the last time he got his hair cut.
B. He will never get his hair cut again.
C. Getting his hair cut is expensive.
D. He is so lazy to get his hair cut.
12: Although Singapore is a developed country, it is not polluted by industry
A. Due to being a developed country, Singapore is not polluted by industry.
B. Despite being a developed country, Singapore is not polluted by industry.
C. As being a developed country, Singapore is not polluted by industry.
D. By being a developed country, Singapore is not polluted by industry.
13: It is interesting to study tourism.
A. Don’t study tourism.
B. To study tourism is not fun.
C. It is not a good idea to study tourism.
D. Studying tourism is interesting.
14: New Zealand and Australia are both surrounded by the sea.
A. Both New Zealand and Australia has sea around it.
B. There is no sea around New Zealand and Australia.
C. New Zealand and Australia don’t have sea.
D. We can’t go swimming in New Zealand and Australia.
15: Australians use English as their mother tongue so they are native speakers.
A. Australians are native speaker although they use English as their mother tongue.
B. Australians are native speaker because they use English as their mother tongue.
C. Australians are native speaker though they use English as their mother tongue.
D. Australians are native speaker owing to they use English as their mother tongue.
Choose A, B, C, D for each gap in the following sentences.
1. Emergency teams are still clearing up the __________ from the plane crash.
A. debris B. dust C. piece D. waste
2. Thousands of buildings and houses were completely destroyed when the earthquake __________ the city.
A. fought B. struck C. happened D. arrived
3. The Maori in New Zealand greet each other by __________ their noses.
A. punching B. touching C. blowing D. shaking
4. If you __________ the president, what would you do to help the environment ?
A. are B. had been C. were D. was
5. Singapore is famous for its __________ and green trees.
A. cleanliness B. cleanly C. cleaning D. clean
6. Air __________, together with littering, is causing many problems in our cities today.
A. pollute B. pollution C. polluting D. polluted
7. If we __________ water carefully, more people will have fresh water.
A. will use B. would use C. using D. use
8. A severe tropical __________ is called a typhoon.
A. drought B. rain C. flood D. storm
#Yumi