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I think walking is good          our health.
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at
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with
C
for
D
so
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I’m going to Nanjing _________Monday morning．  
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at
B
in
C
on
D
of
They often help kids ________ dancing.
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on
B
with
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to
D
at
Vienna,the capital of Austria,is  the River Danube and The Blue Danube is      Strauss.
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on; for
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in; by
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on;by
D
by;on
--- When was the 29th Olympic Games held? --- ________ 8:00 of August 8th ,2008, Beijing.
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At
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On
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In
D
For
Hangzhou is famous _______ producing silk in China.
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from
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at
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in
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for