单项选择题

The police will need to keep a （wary） eye on this area of town.

A．cautious
B．naked
C．blind
D．private
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单项选择题
She （came across） three children sleeping under a bridge.
A．passed by
B．took a notice of
C．woke up
D．found by chance
单项选择题
Come out, or I’ll （bust） the door down.
A．shut
B．set
C．beat
D．break
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