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. lef ...