题目内容
It was about 30 seconds before Alex _____ from the water; we were quite scared.
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We often _____ that when other people do the same things as we do, they do them for the same reasons; but this assumption is not always reasonable.
There is widespread concern that the rising unemployment may _____ a threat to social stability.
After a(n) _____ physical exam, my doctor said I was in good condition except that my blood pressure was a little high.
It is well known what China is a country with rich natural _____and a very big population.
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