单项选择题

Every chemical change either results from energy being used to produce the change, or causes energy to be（）in some form.

A. given off
B. put out
C. set off
D. used up

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单项选择题

Embarrassed, I nodded, trying to think of some way to（）my error

A．make do with
B．make up for
C．go in for
D．go along with

单项选择题

The idea was just beginning to______in America and we knew that it was going to become the way that retailing companies were run.

A. show up
B. catch on
C. open out
D. get by

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