Water, which seems to be so simple and common, is ______ makes life possible.
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that
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which
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what
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What is even more important is_____ the earth cooled down, water began to appear on its surface.
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that
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that as
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which
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which as
He is going to build a team that has a lot of potential and he thinks that is excites him.
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that
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which
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what
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as
Honesty is a basic element in friendsmaking and that is ________ it requires to keep everlasting friendship.
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how
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which
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whether
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what