题目内容
There is widespread concern that the rising unemployment may ______ a threat to social stability.
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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 that China is a country with rich natural ______ and a very big _______ .
Some people believe that the earth can ______ enough food to support at least twice its present population.
Sam ______ the gift of imagination from his family, but he lacked the driving power to take action.
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