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If you sit in a chair _____a long time, your back may begin to hurt.
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at
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in
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on
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for
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China lies    the east of Asia.
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in
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on
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To
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of
         Usually he writes in ink and writes _______ his left hand.
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on
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in
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by
D
with
We are ________ a school trip.
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in
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on
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at
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for
He is sitting __________ the classroom.
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at the front
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in the front of
C
in front
D
in front of
--Do you know when the London 2012 Olympic Games will start?--It will start ________ July 27th, 2012. You can visit London that summer.
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at
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on
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in
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for