14. The discussion ____ alive when an interesting topic was bought in.

　 A. was coming　　　 B. had come　　　　 C. has come　　　 D. came

13. My mind wasn’t on what e was saying so I’, afraid I _____ half of it.

　 A. was missing　　　 B. had missed　　　 C. will　　　　　　 D. missed

12. Sales of CDs have greatly increased since the early 1990s, when people ____ to enjoy the advantages of this new technology.

　 A. begin　　　　　 B. began　　　　　 C. have begun　　　 D. had begun

11. It is said in the book that Thomas Edison (1847-1931) _____ the world leading inventor for sixty years.

　 A. would be　　　　 B. has been　　　　 C. had been　　　　 D. was

10. She _____ her hairstyle in her hometown before she came to Chongqing for a better job.

　 A. would change　　 B. has changed　 　　C. changed　　　　 D. was changing

9. – Thank goodness, you’re here! What _____ you?

　 -- Traffic jam.

　 A. keeps　　　　　　 B. is keeping　　　 C. had kept　　　　 D. kept

8. –What’s wrong with your coat?

　 -- Just now when I wanted to get off the bus, the man next to me ____ on it.

　 A. sat　　　　　　　 B. had sat　　　　　 C. had been sitting　 D. was sitting

7. At last, we found ourselves in a pleasant park with trees providing shade and ____ down to eat our picnic lunch.

　 A. sitting　　 　　　　B. having sat　　　 C. to sit　　　　　 D. sat

6. More than a dozen students in that school _____ abroad to study medicine last year.

　 A. sent　　　　　　　 B. were sent　　　 C. had sent　　　　 D. had been sent

5. Susan decided not to work on the program at home because she didn’t want her parents to know what she _____.

　 A. has done　　　　　 B. had done　　　　 C. was doing　　　 D. is doing