单项选择题

The new law will come into ______ on the day it is passed.

A．effect
B．use
C．service
D．existence
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单项选择题
You can hang up what you like on these ______ walls.
A．bare
B．empty
C．blank
D．vacant
单项选择题
The child was sorry ______ his mother when he arrived at the station.
A．to miss
B．having missed
C．missing
D．to have missed
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