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It was not until all the fish died in the river_____the villagers realized the serious pollution.
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where
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that
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what
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which
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----How unhappy your roommate looks!----Yes，but he’s not willing to tell me what it is____ is troubling him.
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what
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which
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as
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that
Can you explain ________ the sun goes down in the west?
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why is it that
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why it is that
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how it is that
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how is it that
 It was at the railway station         we first met 16 years ago.
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where
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which
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that
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--- Was it by cutting down staff  _    _she saved the firm? ----- No, it was by improving work efficiency.
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how
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that
When was it ______ you met Yao Ming in the street?
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as
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if
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while
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that