________ is known to us all, our government has spared no efforts to control food prices.
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What
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He went to Paris the next year, ______ he lived and was never back.
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where
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when
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which
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that
— Where did you find the professor who made the speech yesterday?— It was in the hall_______ the students often have a meeting.
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where
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which
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that
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when
There is a system ________the waste is disposed of using the principles of ecology.
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which
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where
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that
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at which