--When did the World Exposition(世博会) in Shanghai begin? --The Expo began ________ May 1, 2010.
#49122
A
in
B
on
C
at
D
by
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Mary sits _________ the classroom and I sit _________ her.
#46294
A
in the front of, in the front of
B
in front of, in front of
C
in the front of, in front of
D
in front of, in the front of