31. As soon as he comes back, I’ll tell him when ______ and see him.

A. you will come 　 　B. will you come 　　　

C. you come 　 　D. do you come　　　　　　　　　 　　　　　　　

30. I won’t tell the student the answer to the math problem until he ______ on it for more than an hour.

A. has been working　 　 B. will have worked

C. will have been working　　　 D. had worked

29. Ladies and gentlemen, please fasten your seat belts. The plane _______.

A. takes off　　　 B. is taking off　　　

C. has taken off　　　 D. took off

28. I _______ in London for many years, but I’ve never regretted my final decision to move back to China.

A. lived　　　 B. was living　

C. have lived　　 D. had lived

27. I was giving a talk to a large group of people, the same talk I _______ to half a dozen other groups.

A. was giving　　　 　 B. am giving

C. had given　　　　 　　　 D. have given

26. “You’ve left the light on.” “Oh, so I have. _____ and turn it off.”

A. I’ll go　　　 B. I’ve gone

C. I go　 D. I’m going

25. He has changed a lot. He _______ not what he _______.

A. is, is B. was, was

C. is, was　　 D. was, is

24. Great changes ______ in my hometown in the past twenty years.

A. took place　 B. have taken place　　　 C. were taken place　　 D. have been taken place

23. “I suppose you _________ that report yet?” “I finished it yesterday, as a matter of fact.”

A. didn’t finish B. haven’t finished　　　 C. hadn’t finished　 D. wasn’t finishing

22. -The dinner was delicious!

-I agree. I’m so full.

-That’s too bad. But some dessert ______.

A. has ordered　　　　　　　　　　　　 B. will be ordered

C. has been ordered　　　　　　　　　　 D. was going to be ordered