根据句意及首字母或汉语提示写出单词的正确形式
Columbus discovered America but did not ________ (探索)the new continent.
Nearly 10 percent of the Earth's s ________ is covered by ice.
The artist had s ________ his name in the corner of the painting.
The island has been ruined by ________ (旅游业).
It was warmer now, and the snow was beginning to m ________ .
Several ________ (十年)have elapsed since I graduated from college.
She was being m ________ for her wedding dress.
A great ________ (块;堆)of rocks had fallen down from the cliff and blocked the road.
We can ________ (确认)our reservation.
He didn't pass the exam, but it was a good a ________ .
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