20.(06湖北，31) 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

19.(06四川，22) Look at the timetable. Hurry up! Flight 4026 _______ off at 18:20.

A. takes　 　 B. took　 　C. will be taken 　　　　 　　D. has taken

18. (06福建，31) The moment the 28^th Olympic Games _____ open, the whole world cheered.

A. declared　　 B. have been declared　 C. have declared　 D. were declared

17.(06福建，24) Ladies and gentlemen, please fasten your seat belts. The plane_________.

A. takes off　　 B. is taking off　 　　　　 　C. has taken off　　 D. took off

16. (06江西，21) My cousin went to Canada two years ago. He _______ there for a few months and then went to America.

A. worked　　 B. would work　 C. would be working　　 D. has been working

15. (06湖南，35) In a room above the store, where a party ______, some workers were busily setting the table.

A. was to be held　　 B. has been held　　 C. will be held　 D. is being held

14. (06湖南，24)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

13. (06廣東，32) The young girl sitting next to me on the plane was very nervous. She _____ before.

A. hasn’t flown　　　 B. didn’t fly　 C. hadn’t flown　　 D. wasn’t flying

12. (06重慶，31) 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

11. (06重慶，30) Customers are asked to make sure that they _____ the right change before leaving the shop.

A. will give　　 B. have been given　 C. have given　　 D. will be given