题目内容
After being ________, the particles of water unite and form clouds; then they fall down in the form of fog, rain, snow, or hail.
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28.The English translation may have been ________ into a single more readable book.
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The Chinese ________ is one of the oldest in the world.
But I do think I'm _______ to be his helper. And that he has the same obligation to me.
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