(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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how
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The only existing problem is ____ we can find this special wood in the forest in such a short time.
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when
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where
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that
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whether
I’m afraid he is more of a talker than a doer, which is _________ he never finishes anything.
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that
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when
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where
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why
It is often said that home is _______ the heart is and now part of my heart is with my new classmates.
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what
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how
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where
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when
You are saying that everyone should be equal, and this is ______ I disagree.
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why
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where
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what
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how