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Don’t stop working _____ twelve. 
#58157
A
to
B
at
C
when
D
until
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 Be careful with the knife, ______ you’ll be hurt.
#55157
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so
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or
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who
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__ we are young, we can still do something to help protect the environment.
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David, get up early, ________ you’ll catch the early bus.
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