Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advantages of this new technology.
begin
began
have begun
had begun
Turn on the television or open a magazine and you ________ advertisements showing happy families.
will often see
often see
are often seeing
have often seen
—I hear Jane has gone to the Holy Island for her holiday.
—Oh, how nice! Do you know when she ________?
was leaving
had left
has left
left
—What were you doing when Tony phoned you? —I had just finished my work and________ to take a shower.
had started
started
have started
was starting
I ________ you not to move my dictionary—now I can’t find it.
asked
ask
was asking
had asked