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Although he is a little boy,_____he speaks English well.
#55889
A
/
B
but
C
so
D
and
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I usually sleep with the window open _____ it’s very cold.
#58323
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until
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unless
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when
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 As we all know the H1N1 Flu is so serious, students can’t go into the school _______ they take the temperature and get sure they don’t have a fever.
#55588
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My brother has been teaching ________ he was 21 years old.
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when
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Many people believe we will face environmental disasters _________ we completely change the way we live.
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It is a nice digital camera, ________ a little expensive.
#55558
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as
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since
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though
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