1. About how many elements make up most of the substances we meet in everyday life?
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A.is it that
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B.what it is
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C.it is which
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D.it is that
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2. The heavy rain the harvest of the wheat by two weeks.
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A.set out
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B.set off
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C.set aside
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D.set back
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3. --You don’t go to that supermarket quite often, do you?
--No, I only go there because it’s too far away from my house.
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A.consequently
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B.constantly
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C.occasionally
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D.frequently
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