28. I won’t be able to watch the program because I _____ my homework at that time.

　 A. shall have done　 　　　 B. will do　　 　　　　　　　　　　 C. shall be done　　 　　 D. will be doing

27. I _____ the whole book by the day after tomorrow.

　 A. shall read　　 　　　 B. shall be reading　　 　 C. will read　　 　　　　　 D. shall have read

26. He _____ to meet us at the station but he didn’t see us.

　 A. did go　 　　　　　　 B. didn’t go　 　　　　　　 C. has gone　 　　　　　　 D. was going

25. The doctors could do nothing to save the patient and he _____.

　 A. died　　 　　　　　　　　　　 B. die　　 　　　　　　　　　　 C. was dying　　 　　　　　 D. was dead

24. We _____ to the Great Wall three times in 1999.

　 A. went　　 　　　　　　 B. has been　　 　　　　　　 C. was visited　　 　　　　 D. had visited

23. It won’t be long before such a thing _____ again.

　 A. happened　　 　　　 B. is happened　　 　　　　　　　 C. will happen　　 　　　　　　　 D. happens

22. The key to my door _____. I have looked for it everywhere, but I still _____ it.

A. is missing; can’t find　　 　　　　　　　　　　　　 B. has lost; don’t find

C. has lost; haven’t found　 　　　　　　　　　　　　 D. has been gone; haven’t found

21. I don’t think Jim saw me, he _____ into space.

　 A. just stared　　 　　　 B. was just staring　　 　 C. has just stared　 　　　 D. had just stared

20. Don’t interrupt me . I ___ letters all morning and have written five.

A. write　　 　　　　　　 B. have written　 　　　　 C. was writing　 　　　　 D. have been writing

19. So far solar energy ___ in the world.

A. has not been widely used　 　　　　　　　　　　　 B. is not widely used　

C. was not widely used　　　 　　　　　　　　　　　 D. hasn’t used widely