单项选择题

You have to be ______ when you try to work out mathematical formulas.

A．reasonable
B．rational
C．logical
D．sound
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单项选择题
The White House and other federal buildings were ______ as a plane enters the restricted airspace.
A．vacated
B．empty
C．deserted
D．evacuated
单项选择题
Let's ______ this has never happened.
A．make believe
B．make to believe
C．to make believe
D．to make to believe
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