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---Is Christmas____December 25th or 26th ?   ---25th, I think.
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on
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It is very kind _____ you to help me with my lessons because it is very difficult _____me to learn them well.
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of； for
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of； of
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for；of
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for； for
Please call Mary _______ 354—6403.
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in
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to
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of
Last year I was often ill, but now I am       good health.
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at
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under
Sometimes I work ________ the day and sometimes _________ night.
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on, at
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at, on
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at, in
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in, at
I study for a test _________ working with a group.
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in
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by
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to