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Researchers claim to have found the first proof _______ getting a regular eight hours a night really does make you appear healthier and more attractive.
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as
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that
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how
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which
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Feathers are very light,       we say "as light as a feather".
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My sister was angry ______ what he said.
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 Helen has just heard the news from her father ________ her boyfriend David will come back soon.
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People in Tianjin are proud of ______ they have achieved in the past few years.
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