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China ________ more cars this year than last year. (product)

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I think this book is ________ of all. (use)

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He was being very ________, and wouldn't tell me what he was up to. (mystery)

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Didn't you see the sign on the wall? It says“No ________. ”(smoke)

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This pair of shoes is quite ________. Please show me another pair. (comfortable)

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My ________ of English is very poor. (know)

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Who is the ________ of the little restaurant? (own)

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This is a ________ discovery. (science)

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I don't think it is rewarding __________ too much money on that kind of thing. (spend)

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They are busy __________ using chopsticks now. (practice)