People take naps at noon in warmer climates, ____ the heat makes work difficult in the early afternoon.
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_________ the unwritten rule goes, study is good, but health comes first.
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After dinner they talked about the persons and things _______ they still remembered.
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which
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that
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who
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Three minutes later, more than ten policemen turned up at the spot the accident happened.
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which
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what
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where
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