18. While the secretary() his desk, he found the long lost report.

A. had been cleaning B. is cleaning

C. has been cleaning √D. was cleaning

19. As soon as he () his error, Rockfeller made the necessary corrections

to his data collected.

A. discovered B. has discovered

C. has promoted √D. was cleaning

20. Fred believed that his friend () by his employer a month or so ago.

√A. discovered B. has discovered C. has promoted D. was cleaning

21. I think I’ll wait until the mail() .

A. should come B. is coming √C. comes D. will come

22. We could have bought a new are last year, but we really () it.

A. can’t afford √B. couldn’t afford

C. won’t afford D. unable to afford

23. If you don’t pay your taxes ,they () .

A. have you arrested (逮捕) √B. will have you arrested

C. must have you arrested D. have you arrest

24. I () meeting you ever since we parted.

A. was looking forward to √B. have been looking forward to

C. had been looking forward to D. looked forward to

25. They told me that by the end of the month they() in this flat for 12 years.

A. has lived B. will have lived

C. has been living √D. would have been living