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 It was in 1969 ______ two Americans went to the moon by spaceship.
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 For a simple question, ______ is not necessary to ask for her help.
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it
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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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I just wonder ____________ that makes him so excited.  
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why it does
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what he does
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how it is
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what it is
It was because he was ill ______ we decided to return home.
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why
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It was 80 years before Christopher Columbus crossed the Atlantic        Zheng He sailed to East Africa
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