28. The couple ____. I really don’t know why.

　　A. always quarrel　　　

　　 B. are always quarreling

　　C. have always quarreled　

　　D. have always been quarreled

27. - The Chinese astronaut Yang Liwei is here already.

　　- I ____ he ____ until tomorrow.

　　A. think; is coming　　　　

　　 B. thought; would come

　　 C. didn’t think; was coming

　　 D. don’t think; will come

26. SARS ____ in Hong Kong in the winter of 2002.

　　 A. was broken out　　　　　　　　　 　 B. was broke out　　

　　 C. broke out　　　　　　　　　　　　 　D. was breaking out

25. When you come into the exhibition hall, you can see a large board with a notice on it, saying visitors ____ not to touch the exhibits.

　　 A. will request　　　　　 B. request　　　　　 C. are requesting　　 D. are requested

24. - Has William finished writing his graduation paper yet?

　　- I don’t know exactly, but he ____ all day.

　　 A. is writing　　　　　　　　　　 　B. has been writing

　　 C. was writing　　　　　　　 　　 D. wrote

23. - Would you like to tell me what our teacher said just now?

　　- She said that light ____ faster than sound.

　　 A. travels　　　　　 B. traveled　　 　　　 C. would travel　　　　 D. was traveling

22. - Did you telephone the manager’s office?

　　- Yes, he ____ back before 9 o’clock this morning.

　　 A. expects　　　　　 B. is expected　　　　　 C. expected　　　　　D. was expected

21. You can certainly leave the classroom as soon as your homework ____.

　　A. has done　　　　　　　　　　 　 B. has been done　　

　　C. will be done　　　　　　　　　 D. will have been done

20. - Bob must be wealthy.

　　 - Yes, he ____ more in one day than I do in a week.

　　A. is earning　　　　　　 B. earns　　　 　　　 C. had earned　　　　　 D. has earned

19. - How is the boy?

　　- Sorry. He ____ though the doctor made every effort to save him.

　　A. died　　　　　 B. was dead　 　　　 C. had died　　　　　 D. has been dead