1. 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

　　2. Turn on the television or open a magazine and you ________ advertisements showing happy families.

　　A. will often see B. often see

　　C. are often seeing D. have often seen

　　3. 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

　　4. What were you doing when Tony phoned you?

　　I had just finished my work and________ to take a shower.

　　A. had started B. started

　　C. have started D. was starting

　　5. I ________ you not to move my dictionarynow I cant find it.

　　A. asked B. ask

　　C. was asking D. had asked