21. Young people spend most of their time _________, for they don’t want to stay at home all day.
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A. outdoor
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B. outdoors
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C. indoor
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D. indoors
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22. The number of the teacher invited _____ twelve, but a number of them ___ late for different reasons.
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A. were; was
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B. was; was
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C. was; were
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D. were; were
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