单项选择题

As teachers we should concern ourselves with what is said, not what we think______.

A．ought to be said
B．must say
C．have to be said
D．need to say
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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
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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