21． It's seven thirty. I_________ go to school.
A. have got B. have got to C. got to D. had got to
22． My God! I’m getting late again，what will my boss say?
Try to keep ________; we will think of an excuse．
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A． silent
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B． calm
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C． still
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D． quiet
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23． If a sunny day tomorrow, let’s ________ it and go climbing the mountains．
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A．make from
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B． make use of
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C． make up of
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D． make about
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