I. Fill in the blank with an appropriate preposition 1. Many other species exist________________ this planet. 2. Human beings have a great influence________________ the rest________________ the world. 3. They are affecting the water supply by using water________________ industry and agriculture. 4. They are changing weather conditions by cutting________________ trees in the forests. 5. This has resulted________________ two serious consequences. 6. As a result, the number________________ rare animals is decreasing so rapidly that they are________________ danger________________ becoming extinct. 7. Scientists have made lists________________ endangered species and suggested ways to save them. 8. Many organisations have been set________________ and funds have been raised. 9. Thousands of national parks all________________ the world have been established to protect endangered animals. 10. If people’s interference________________ the environment decreases, more species will survive and produce offspring. 11. The amount of solar energy that reaches the earth depends____________________ the atmosphere. 12. The natural environment consists____________________ all natural resources. 13. Solar energy can be changed____________________ electricity. 14. Human beings have a great influence____________________ the rest of the world. 15. What exactly is the influence of air pollution____________________ human beings? 16. The campaign will hopefully ensure the survival____________________ the tiger. 17. The EU has imposed a ban____________________ the import of seal skins. 18. Human beings are responsible____________________ the changes in the environment. 19. If people’s interference____________________ the environment decreases, more species will survive and produce off- spring. 20. National parks should be set____________________ to save animals and plants. 21. ______ present, most of our energy comes______ fossil fuels. 22. Solar energy can be changed______ electricity. 23. When water moves ______ a high place to a lower place, it makes energy. 24. Water energy is used______ create electricity. Its power gives energy______ pollution. 25. Nuclear energy can provide enough electricity______ the world’s needs for hundreds of years. 26. Many organizations have been set ______ to study alternative sources of energy. 27. How______ make use______ alternative sources of energy is a question for researchers all______ the world. II. Write the correct tenses. 1. Look! The train________(come). It always__________(come) to the station on time. 2. I need an umbrella because it (rain). 3. The burglar__________(open) the safe when he___________(hear) footsteps. He immediately________(put) out his torch and_____________ (crawl) under the bed. 4. Just as I_________(wonder) what to do next ,the phone rang. 5. Why _____________you_____________ ( buy ) this paint last week ? 6. Until yesterday, I_______ (never, hear) about it. 7. Sam___________ (leave) before we________ (get) there. 8. He_____________ (watch) television when the phone rang. 9. After the guests_________ (leave), I_________ (go) to bed. 10. When Judy (get) home, her hair _______still (be) wet . 11. Water (consist) __________________ of hydrogen and oxygen. 12. John (sleep) __________________ right now 13. Alice and Louise (not, buy) __________________ anything at the store yesterday. 14. After they (leave) __________________, we (sit) __________________ down and rested. 15. John and Mary (talk) __________________ on the phone now. 16. After three days of rain, I’m glad that the sun (shine) __________________ again today. 17. He (write) __________________ his report for two days, but he (not, finish) __________________ it yet. 18. I (stand) __________________ under a tree when it (begin) __________________ to rain. 19. He (need) __________________ a pen at the moment. 20. Last year at this time, I (attend) __________________ school.

I. Fill in the blank with an appropriate preposition
1. Many other species exist________in________ this planet.
2. Human beings have a great influence______by__________ the rest__________of______ the world.
3. They are affecting the water supply by using water_________in_______ industry and agriculture.
4. They are changing weather conditions by cutting_______off_________ trees in the forests.
5. This has resulted_______in_________ two serious consequences.
6. As a result, the number________of________ rare animals is decreasing so rapidly that they are_______in_________ danger____of____________ becoming extinct.
7. Scientists have made lists_________of_______ endangered species and suggested ways to save them.
8. Many organisations have been set________up________ and funds have been raised.
9. Thousands of national parks all_____over___________ the world have been established to protect endangered animals.
10. If people’s interference ( can thiệp )________in________ the environment decreases, more species will survive and produce offspring.
11. The amount of solar energy that reaches the earth depends________on____________ the atmosphere.
12. The natural environment consists________of____________ all natural resources.
13. Solar energy can be changed___________into_________ electricity.
14. Human beings have a great influence___________by_________ the rest of the world.
15. What exactly is the influence of air pollution___________in_________ human beings?
16. The campaign will hopefully ensure the survival__________of__________ the tiger.
17. The EU has imposed a ban________of____________ the import of seal skins.
18. Human beings are responsible________for____________ the changes in the environment.
19. If people’s interference________in____________ the environment decreases, more species will survive and produce off- spring.
20. National parks should be set_________up___________ to save animals and plants.
21. ____at__ present, most of our energy comes___from___ fossil fuels.
22. Solar energy can be changed___into___ electricity.
23. When water moves ____to__ a high place to a lower place, it makes energy.
24. Water energy is used__to____ create electricity. Its power gives energy______ pollution.
25. Nuclear energy can provide enough electricity___for___ the world’s needs for hundreds of years.
26. Many organizations have been set __up____ to study alternative sources of energy.
27. How____to__ make use__of____ alternative sources of energy is a question for researchers all___over___ the world.
II. Write the correct tenses.
1. Look! The train___is coming_____(come). It always__comes________(come) to the station on time.
2. I need an umbrella because it (rain).
3. The burglar______was opening____(open) the safe when he_____heard______(hear) footsteps. He immediately___put_____(put) out his torch and_____crawled________ (crawl) under the bed.
4. Just as I____was wondering_____(wonder) what to do next ,the phone rang.
5. Why ______did_______you_________buy____ ( buy ) this paint last week ?
6. Until yesterday, I___had never heard____ (never, hear) about it.
7. Sam______had left_____ (leave) before we_____got___ (get) there.
8. He_______was watching______ (watch) television when the phone rang.
9. After the guests_____had left____ (leave), I___went______ (go) to bed.
10. When Judy (get) got home, her hair ____was___still (be) wet .
11. Water (consist) ________consists__________ of hydrogen and oxygen.
12. John (sleep) __________is sleeping________ right now
13. Alice and Louise (not, buy) ______didn't buy____________ anything at the store yesterday.
14. After they (leave) _________had left_________, we (sit) ______sat____________ down and rested.
15. John and Mary (talk) _________are talking_________ on the phone now.
16. After three days of rain, I’m glad that the sun (shine) _____shines_____________ again today.
17. He (write) ______has written____________ his report for two days, but he (not, finish) ________hasn't finished__________ it yet.
18. I (stand) _________was standing_________ under a tree when it (begin) ________began__________ to rain.
19. He (need) ___________is needing_______ a pen at the moment.
20. Last year at this time, I (attend) _______was attending___________ school.

1.in
2.by/of
3.in
4.off
5.in
6.of/in/of
7.of
8.up
9.over
10.in
11.on
12.of
13.into
14.by
15.in
16.of
17.of
18.for
19.in
20.up
21.at/from
22.into
23.to
24.to/of
25.for
26.up
27.to/of/over
II. Write the correct tenses.
1.is coming/comes
2.is rainy.
3.was opening/heard/put/crawled
4.was wondering
5.did you buy
6.had never heard
7.had left/got
8.was watching
9.had left/went
10.was
11.consists
12.is sleeping
13.didn't buy
14.had left/sat
15.are talking
16.shines
17.has written/hasn't finished
18.was standing/bega
19.is needing
20.was attending