题目内容

He was going to bed when there was a knock _____ the door.

A. on
B. from
C. in

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Nobody is here; they must ___________ home.

A. go
B. went
C. have gone

The food smells good. I can’t wait ________.

A. taste
B. to taste
C. tasting

Our boss is rather busy. You’d better ____________ an appointment with him.

A. take
B. get
C. make

Light travels faster than ________.

A. sound
B. sounds
C. a sound