31. -Have you known Dr. Jackson for a long time?

-Yes, since she ______ the Chinese Society.

　 A. has joined　　　　　　 　　　 B. joins　 　　 　　C. had joined　　　 　 　　　　 D. joined

30. It is reported that by the end of this week the stock exchange_________ by about 10%.

A will have risen　　 B has risen　 　　　 C will be rising　　 　　 D has been rising

29.-What were you doing when Tom came to see you?

　 --- I _________ on my overcoat and _______ to visit a friend of mine.

　　 A have just put; leaving 　　　　　　　 B was put; was left 　 C had just put; was leaving　 　　　 D was putting; left

28. Over the past decades, sea ice ________ in the Arctic as a result of global warming.

　　 A had decreased　 　　　 B has been decreasing 　C 　decreased　 　　 D is 　decreasing

27. – Why don’t we choose that road to save time?

　 -- The bridge to it _______.

A has repaired　　 B is repaired　 　　　　 C is being repaired　 　　 D will be repaired

26. East of our school ________ two companies ______ electric motorbikes are made.

A are; that　　　　 　　　　 B is; where　　 　　　　 C is; that　　　 　　　　 D are; where

25. In my opinion, no search engine can ______ Baidu in searchscope and speed.

A compete　　　　 　　　　　　　 B equal　　　　 　　　　 C win　　　　　 　　　　　　　 D suit

24. Mr. Smith, who ________ as a carpenter for over 10 years, is now a very famous statesman in this country.

A has worked　　 　　　　　　　　 B works　　　 　　　　　 C had worked　 　　　　　　　　　 D worked

23. Tom _________ two of his classmates ____________ invited to the party.

A as well as; was　　　 　　　　　 B as good as; were　　　　　 C and; have　 　　　　　 　　　　D as well; has been

22. With nothing _________ behind, he felt _________.

A left; relieving　　　 　　　　　　　 B leaving relief　 　　　　　　 C left; relieved　　　　 　　　　　 D leaving; relieved