21. In one years time, she________for this company for 15 years.

A. will be working​​B. will have been working

C. will work​​​D. has worked

22. His health has improved a lot since he________doing exercises regularly.

A. starts​​​B. started​​​C. has started​​D. had started

23. She hurt herself while she________hide-and-seek with her friends.

A. is playing​​​B. had played​​​C. played​​​D. was playing

24. .What________at 9 oclock last night? I phoned you but couldnt get through to you.

A. did you do​​​B. were you doing​​C. would you do​​D. had you done

25. It is raining heavily with rolls of thunder. We________such a terrible thunderstorm.

A. would never see​​B. had never seen​​C. have never seen​​D. never see

26. I _______ my old teacher last week.

A. visited​​​B. visit​​​​C. am visiting​​​D. have visited

27. My brother usually ________me for help when he has any difficulties with his homework.

A. ask​​​​B. asks​​​​C. asked​​​D. has asked

28. I ______ all of my homework last night.

A. finish​​​B. will finish​​​C. have finished​​D. finished

29. Lan________ learning English a few years ago.

A. starts​​​B. will start​​​C. started​​​D. is starting

30. Only after she________from a severe illness did she realize the importance of good health.

A. would recover​​B. has recovered

C. had recovered​​D. was recovering