11. Rainforests and burned at such a speed that they will disappear from the earth in the near future.
A. are cutting down B. are cut down C. are being cut down D. had been cut down
12. Up to now, the program ______ thousands of children who would otherwise have died.
A. would save B. saves C. had saved D. has saved
13. Mother wanted to be a good provider, a role she______ since her marriage to Father.
A. shoulders B. shouldered C. is shouldering D. has been shouldering
14. --Have you moved into your new flat?
--No, I haven't. It ________ at present.
A. will be decorated B. is being decorated C. is decorating D. was decorated
15. This is the first time we______ a film in the cinema together as a family.
A. see B. had seen C. saw D. have seen
16. --Are you still very busy?
--Yes, I ________ the report for the manager and it won't take long.
A. am just finishing B. have just finished C. had just finished D. am just going to finish
17. Over the past decades, sea ice ________ in the Arctic as a result of global warming.
A. had decreased B. decreased C. has been decreasing D. is decreasing
18. --What’s our homework for today, Peter?
--Oh, sorry. I ________.
A. hadn’t concentrated B. wouldn’t concentrate
C. haven’t been concentrating D. wasn’t concentrating
19. --Has Sam finished his homework today?
--I have no idea. He _______ it this morning.
A. did B. has done C. was doing D. had done
20. --Isn’t it hard to drive downtown to work?
--Yes, that’s why I ________ to work by train.
A. have gone B. have been going C. was going D. will have gone
11. C。现在进行时可以表示现阶段正在进行的动作或存在的状态。根据题干内容可知，这句话表示雨林正在遭受砍伐，因此用现在进行时的被动语态。
12. D。句意：截止到现在，这个项目已经挽救了成千上万的本来会死去的孩子的生命。up to now是现在完成时态的标志，表示“直到现在，到目前为止”。
13. D。句意：母亲想成为一名好的供养人——一个自她嫁给父亲以来一直在担任的角色。因为有since而且是动作的延续，所以用现在完成进行时，即she has been shouldering作定语，修饰a role．
14. B。根据句意可知，新的公寓正在装修之中，故用现在进行时的被动语态。
15. D。This is the first time that…句型常与现在完成时连用。
16. A。根据对话内容可知，本题用现在进行时表示此时此刻的情况，即正在写报告。
17. C。由从句中的over the past decades可知，此处应该用现在完成进行时，表示动作从过去一直持续到现在并将持续下去。
18. D。wasn’t concentrating表示“刚才我没集中注意力”。
19. C。过去进行时可以表示过去某段时间内一直在做某事，但是该动作不一定完成。句意为：Sam今天写完作业了吗?我不知道，他今天上午在做着呢。应该使用过去进行时，表示上午当时正做着，但不知是否完成。
20. B。have been doing为现在完成进行时，表示现在以前这段时间一直进行的一个动作。
A. are cutting down B. are cut down C. are being cut down D. had been cut down
12. Up to now, the program ______ thousands of children who would otherwise have died.
A. would save B. saves C. had saved D. has saved
13. Mother wanted to be a good provider, a role she______ since her marriage to Father.
A. shoulders B. shouldered C. is shouldering D. has been shouldering
14. --Have you moved into your new flat?
--No, I haven't. It ________ at present.
A. will be decorated B. is being decorated C. is decorating D. was decorated
15. This is the first time we______ a film in the cinema together as a family.
A. see B. had seen C. saw D. have seen
16. --Are you still very busy?
--Yes, I ________ the report for the manager and it won't take long.
A. am just finishing B. have just finished C. had just finished D. am just going to finish
17. Over the past decades, sea ice ________ in the Arctic as a result of global warming.
A. had decreased B. decreased C. has been decreasing D. is decreasing
18. --What’s our homework for today, Peter?
--Oh, sorry. I ________.
A. hadn’t concentrated B. wouldn’t concentrate
C. haven’t been concentrating D. wasn’t concentrating
19. --Has Sam finished his homework today?
--I have no idea. He _______ it this morning.
A. did B. has done C. was doing D. had done
20. --Isn’t it hard to drive downtown to work?
--Yes, that’s why I ________ to work by train.
A. have gone B. have been going C. was going D. will have gone
11. C。现在进行时可以表示现阶段正在进行的动作或存在的状态。根据题干内容可知，这句话表示雨林正在遭受砍伐，因此用现在进行时的被动语态。
12. D。句意：截止到现在，这个项目已经挽救了成千上万的本来会死去的孩子的生命。up to now是现在完成时态的标志，表示“直到现在，到目前为止”。
13. D。句意：母亲想成为一名好的供养人——一个自她嫁给父亲以来一直在担任的角色。因为有since而且是动作的延续，所以用现在完成进行时，即she has been shouldering作定语，修饰a role．
14. B。根据句意可知，新的公寓正在装修之中，故用现在进行时的被动语态。
15. D。This is the first time that…句型常与现在完成时连用。
16. A。根据对话内容可知，本题用现在进行时表示此时此刻的情况，即正在写报告。
17. C。由从句中的over the past decades可知，此处应该用现在完成进行时，表示动作从过去一直持续到现在并将持续下去。
18. D。wasn’t concentrating表示“刚才我没集中注意力”。
19. C。过去进行时可以表示过去某段时间内一直在做某事，但是该动作不一定完成。句意为：Sam今天写完作业了吗?我不知道，他今天上午在做着呢。应该使用过去进行时，表示上午当时正做着，但不知是否完成。
20. B。have been doing为现在完成进行时，表示现在以前这段时间一直进行的一个动作。
