第22空正确答案是(  )

第22空正确答案是(  )

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Let's write them__________before we forget them.

Let's write them__________before we forget them.

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It__________us five hours to work out the problem.

It__________us five hours to work out the problem.

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He is a__________boy, so he can' t go to the park by himself

He is a__________boy, so he can' t go to the park by himself.

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He traveled all over the world__________ he had a man-made l

He traveled all over the world__________ he had a man-made leg.

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