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 --  ______ does your sister study for the English exam?  --By asking her teacher for help.
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A
How
B
Where
C
What
D
Why
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_______ Peter is old and weak, he still has to work.
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Even though
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So
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 I always sleep with windows open _______ it is too cold outside.
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until
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if
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that
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　　　　 it rained heavily this morning, nobody in our class missed the lesson.
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Don’t forget to wash your hands _________ you have meals.
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before
B
until
C
though
D
unless