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
If the fire alarm is sounded, all residents are requested to______ in the courtyard.
A．converge
B．assemble
C．crowd
D．accumulate
单项选择题
Bob missed the last bus and was ready to walk all the way home when a van______ beside him.
A．closed up
B．brought up
C．pulled up
D．hung up
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