In the past there were no trees ________ in or around the village.

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Zhongguancun is the new center ________ Chinese science and technology.

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Take ________ measures you consider best.

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Not until all the fish died in the river ________ how serious the pollution was.

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Mr Cox was warned by an engineer that he was ________ in the building.

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－I didn't go to class last night because my car broke down.

－You ________ mine. I wasn't using it.

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I found that he hung my old trousers behind the door, ________ with a hole in each of the pockets.

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－I rang you at about ten, but there was no reply.

－Oh, that was probably ________ I was seeing the doctor.

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－It's said that China has been a member of the WTO.

－Well, it's wonderful that Chinese people ________ have made so much progress during these years.

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I should appreciate ________ if you could come to my birthday party.

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