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
As a salesman, he works on a (an)______basis, taking 10% of everything he sells.
A．income
B．commission
C．salary
D．pension
单项选择题
A．suitableB．sufficientC．largeD．broad
A．suitable
B．sufficient
C．large
D．broad
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