单项选择题

The rest of his life is () to the cause of international exchange of visiting scholars.()

A. added
B. put
C. saved
D. committed

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The car crashed into the train, and the driver was killed ______ the spot.()

A. on
B. at
C. to
D. by

单项选择题

Thoughts are expressed () words

A. by all means
B. by no means
C. by the way
D. by means of

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