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At school, some students are active       some are shy, yet they can be good friendswith one another.
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while
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although
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so
D
as
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 It is in the year of 2010        a severe drought hits Yunnan province.
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until
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 I was putting on my shirt ______ my telephone rang.
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while
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     I admit that there are problems, I don’t agree that they cannot be solved.
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It is so heavy a box _____ no one can move.
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B
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 He was about to tell me the secret ______ someone patted him on the shoulder.
#30741
A
as
B
until
C
when
D
while