21. As is known to all, ．If we want to live ． happy life, we must all work harderlife is hard for any of us
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A. /; /
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B./; a
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C. a; /
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D. a ; a
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22. Could you drive me to the supermarket at noon if ?
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A. it’s convenient of you
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B. you are convenient
|
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C. it’s convenient for you
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D. you will be convenient
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