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Hundreds of students came to Shaoxing to work _______ the World Choir Games in 2010,
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A
at
B
with
C
for
D
on
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It’s a pity that his son was born ________ a weak heart.
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in
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from
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The accident happened _____the old man  _____ a cold morning .
#46188
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to ; to
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under; on
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 Lily often helps her sister ____her homework.
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by
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of