单项选择题

The pressure ______ causes Americans 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
On turning the corner, we saw the road ______ steeply.
A．departing
B．descending
C．decreasing
D．depressing
单项选择题
There ought to be less anxiety over the perceived risk of mountain climbing than ______ in the public mind today.
A．exists
B．exist
C．exiting
D．to exist
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