_ the afternoon of April 30th, many foreign visitors arrived _Shanghai

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     _ the afternoon of April 30th, many foreign visitors arrived      _Shanghai.   [     ]
A. In; at
B. On; in
C. On; to

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举一反三

The earthquake which happened in Yushu      14th April 2010 was a big disaster.   [     ]
A. at
B. on
C. in
D. to

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Don"t let yesterday use            too much      today.       [     ]
A. up; /
B. up; of
C. on; of
D. on; for

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It"s really nice    _ you        so.        [     ]
A. for; to say
B. for; saying
C. of; to say
D. of; say

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We often eat potatoes____ picnic. [     ]
A. at
B. in
C. in the
D. at the

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I"d like to trek ________ the jungle.[     ]
A. through
B. across
C. over
D. on

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