下列每组单词中有一个是不同类，选出这个词（共10小题；每小题1分，满分10分）
--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
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