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The teaching building has five floors. My classroom is ______________ the third floor.
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The students sometimes complain about their new teacher because he is too strict ____ them. 
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about
His mother is friendly____ us.
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 Can I speak _____ Mr Wang?
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Forget it, John. I said that just ________ fun. 
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It’s very kind_______you to buy an air ticket________Singapore for me．
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of；of