27．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 |
Nobody knew _______ a living in that country.
| A．to do | B．to make | C．how to do | D．how to make |
The old man needs at most five hour’s sleep a night ,but he__________ for over seven hours tonight.
A. has fallen asleep B has slept C has gone to bed D. has gone to sleep
I’m really getting too fat. From now on, I________ more exercise and eat less food.
A have done B do C am doing D will do
You don’t need__________ her. I_________ her for several times.
A describe, had met B describe, meet C to describe, have met D describe, met
His speech in English was difficult__________.
A in following B for being followed C to follow D to be followed by