单项选择题

The pressure ______ causes American to be energetic, but it also puts them under a constant emotional strain.

A．to compete
B．competing
C．to be competed
D．having competed
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单项选择题
I was ______ the point of telephoning him when his letter arrived.
A．to
B．on
C．at
D．in
单项选择题
In 1914, an apparently insignificant event in a remote part of Eastern Europe______ Europe into a great war.
A．inserted
B．imposed
C．pitched
D．plunged
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