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
We all know that ______ speak louder than words.
A．movements
B．performances
C．operations
D．actions
单项选择题
Many countries are increasing their use of natural gas, wind and other forms of ______.
A．energy
B．source
C．power
D．material
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