【正文】
whether______. was easy to phone to Los Angeles student could hear her from 75 feet away students had grasped her lesson waves were slower than electricity thought that electricity was _________. than sound waves than sound waves so fast as sound waves fast as sound waves thought Tom was wrong because _______. in Los Angeles showed a different time from those in New York ricity was slower than sound waves was not good at physics at all 39。clock here it39。 but then one of the girls raised her hand, and Miss Gogers said.“Yes, Kate.” “I disagree,”Kate said.“Your brother would hear you earlier because when it39。 are still working 4. Father _____ for London on business upon my arrival, so I didn’t see him. A. has left B. left C. was leaving D. had left 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 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 7. At last, we found ourselves in a pleasant park with trees providing shade and ____ down to eat our piic lunch. A. sitting B. having sat C. to sit D. sat 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 9. – Thank goodness, you’re here! What _____ you? Traffic jam. A. keeps B. is keeping C. had kept D. kept 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 11. It is said in the book that Thomas Edison (18471931) _____ the world leading inventor for sixty years. A. would be B. has been C. had been D. was 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 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 14. The discussion ____ alive when an interesting topic was bought in. A. was ing B. had e C. has e D. came 15. – You were out when I dropped in at your house. Oh, I _____ for a friend from England at the airport. A. was waiting B. had waited C. am waiting D. have waited 16. – I hear Jane has gone to the Holy Island for her holiday. Oh, how nice! Do you know when she _____? A. was leaving B. had left C. has left D. left 17. – Has Sam finished his homework today? I