单项选择题

Preparations are being made for the Olympic Games ______ in Beijing in 2008.

A．held
B．holding
C．to hold
D．to be held
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单项选择题
If ______ to a high temperature, ice will change to water.
A．heating
B．being heated
C．to heat
D．heated
单项选择题
Children shouldn't ______ on the conversation between their parents and others.
A．break in
B．break down
C．break out
D．break away.
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