—When did the Shanghai Expo open?—_____ May lst, 2010. [ ]A. In B

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—When did the Shanghai Expo open?
—_____ May lst, 2010.  [     ]
A. In
B. On
C. At
D. By

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举一反三

The desk _____ the teacher is _____ the classroom.    [     ]
A. of; in front
B. to; in front of
C. at; before
D. for; in the front of

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It"s easy _____ us to finish the homework _____ time.[     ]
A. for; on
B. to; in front of
C. for; before
D. of; at

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_____ the help of my classmates, I"ve improved my English.    [     ]
A．By
B．With
C．Under
D．For

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_____ Friday evening, I like to go to movies.    [     ]
A. In
B. On
C. For
D. At

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—Where"s our library?
—It"s _____ the right side of the teacher"s office.        [     ]
A. at
B. for
C. on
D. in

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