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—When did the Shanghai Expo open? —_______May 1st, 2010.
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A
In
B
On
C
At
D
By
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Listen! Some birds are singing __________ the tree.
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 —It’s a pity that I can only live here for two days _______.—Why not stay for another day? I know you have three days off.
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of
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as
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to