1. Given the chance to show his ability, he regained ___________ and began to succeed in school.
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It is so difficult to _____________the bottom of the ocean because some parts are very deep.
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.