单项选择题

Cross the road one at a time -- don' t ______ up.

A．set
B．group
C．bunch
D．hold
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单项选择题
Because of a lack of money, we had to ______ the plan later.
A．call off
B．call on
C．call up
D．call for
单项选择题
As a ______ woman she was then among the few mothers who encouraged their daughters to take part in social activities.
A．sensitive
B．sensible
C．serious
D．senseless
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