单项选择题

Have you taken some measures to guard against the possibility that these schemes might ______ once again

A．fall apart
B．fall out
C．fall through
D．fall in
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单项选择题
During the long waiting, passengers had nothing to do but______ books and magazines.
A．thumb through
B．thumb over
C．thumbing through
D．thumbing over
单项选择题
If you are always______ by uncertainty in doing anything, you'll come to nothing.
A．broken down
B．weighed down
C．turned down
D．pulled down
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