单项选择题

America will never again have as a nation the spirit of adventure as it ______before the West was settled.

A．could
B．was
C．would
D．did
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单项选择题
To survive in the intense trade competition between countries, we must______ the qualities and varieties of products we make to the world-market demand.
A．improve
B．enhance
C．guarantee
D．gear
单项选择题
This is an ideal site for a university______ it is far from the downtown area.
A．provided that
B．now that
C．so that
D．in that
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