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---Do you often spend half an hour       your homework every day?---Yes, I do.
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for
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I’m standing on the Great Wall of China and talking _______ you.
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in
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on
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to
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for
I like the black watch. What      Lily?
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at
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for
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about
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in
He’s got a birthday cake____ his ____ birthday.
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on ，thirteen
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for ,thirteen
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on ,thirteenth
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in ,thirteen
— Does she often get to school ____________ bus?—Yes, quite often.
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by
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on
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with
Be careful when you go ____ the street because the trafficis very busy at the moment.
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across
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behind
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between
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over