The teaching building has five floors. My classroom is ______________ the third floor.
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on
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--- Is there any flowers _______ the tree.--- No. But there are many birds _________ it.
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in, on
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in, in
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on, in
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on, on
They are very grateful _______ us _______ them so much help.
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to, to give
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of, to give
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for, give
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to, for giving
—When were you born? —I was born ________ the morning of February 25th,1997.
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