--Must I come at four o’clock? -- Oh, no, you ______.
A. can’t B. mustn’t C. needn’t.
I’m sorry I kept you ______ for a long time.
A. wait B. waiting C. waited
We should eat ________ food so that we can enjoy a better life.
A. healthy enough B. enough health C. enough healthy
--Would you mind _______ my dog when I am away?
--Of course not.
A. looking after B. taking care C. keeping away
My mother asks us _______ fingernails long.
A. keep B. to keep C. not to keep
The old man didn’t have a rest ______ his son came back..
A. after B. until C. when
