题目内容

It is so difficult to _____________the bottom of the ocean because some parts are very deep.

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It was about 30 seconds before Alex ____________ from the water; we were quite scared.

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.