单项选择题

If you don't ______ the children properly, Mr. Chiver, they'll just run riot.

A．warrant
B．supervise
C．mobilize
D．manipulate
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The number of old people is to ______ in the new century.
A．swell
B．switch
C．sweep
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As an excellent shooter, Peter practiced aiming at both ______ targets and moving targets.
A．standing
B．stationary
C．still
D．stable
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