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
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单项选择题
We must ______ that the experiment is controlled as rigidly as possible.
A．secure
B．ensure
C．assure
D．issue
单项选择题
Because Edgar was convinced of the accuracy of this fact, he ______ his opinion.
A．struck at
B．strove for
C．stuck to
D．stood for
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