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

--This program is killing me! Everything has to be finished before next Friday.-- ______, John. It's not the end of the world.

[A] Take it easy
[B] Take care
[C] Be careful
[D] Be yourself

单项选择题

When the peace talk failed, there was a very real fear that war may ______ at any time.

[A] break out
[B] break up
[C] break off
[D] break down

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