单项选择题

The energy gained from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.

A. conduct
B. proceed
C. progress
D. practice
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单项选择题
Things went well for her during her early life but in her middle age her________seemed to change.
A．affair
B．luck
C．event
D．chance
单项选择题
The invention of electricity made great contribution to civilization ______ which subsequently there are few findings comparable until now.
A. to
B. in
C. for
D. from
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