23. (’06浙江，16) My friend, who _____ on the International Olympic Committee all his life, is retiring next month.

A. served　　 B. is serving　　 C. had served　　 D. has served

22. (’06浙江，7) The company had about 20 notebook computers but only one-third ______ used regularly. Now we have 60 working all day long. 　　　

A. is　　 　　 B. are　　 　C. was　 　　　　 　D. were

21.(’06浙江，6)This machine ______. It hasn’t worked for years.

A. didn’t work　 　　　　　 B. wasn’t working　 　　 　C. doesn’t work　 　　　　　　 D. isn’t working

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