(2013·安徽，21)From space, the earth looks blue.This is ________about seventyone percent of its surface is covered by water.
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why
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The South Pole isn’t _____ people could find a comfortable place to live, for the average winter temperature there is below-40℃.
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which
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that
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what
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where
Making mistakes is a part of life. ___________ matters is ___________ you do afterwards.
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It; what
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All; what
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What; what
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That; what
I am afraid he's more of a talker than a doer, which is ________ he never finishes anything.(2011·山东)
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that
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when
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where
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why
What has not yet been announced is _____ the English contest will be held. I guess it may be held in the hall.
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where
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that
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when
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how