单项选择题

In the museum, we saw the model of a house designed by the pioneers and built ______ wood and brick.

A．up
B．on
C．of
D．by
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单项选择题
The manager of the restaurant has made it clear that a cook will be immediately fired if he is found ______ in the kitchen.
A．smoke
B．smoked
C．smoking
D．to smoke
单项选择题
When the peace talk failed, there was a very real fear that war may ______ at any time.
A．break off
B．break up
C．break out
D．bread down
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