The old man often looked back on the past days ________ he worked hard to make a living.
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British scientists have produced _____ they believe is the world’s smallest Christmas card．
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which
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who
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that
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what
Once more I have to leave Beijing, ______ I have been living for eight years.
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that
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where
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Peter was so excited ______ he received an invitation from his friend to attend the wedding.
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where
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that
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why
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A warm thought suddenly came to me ___I might use the pocket money to buy some flowers for my mother’s birthday .
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if
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when
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that
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which