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
The pollution question as well as several other issues is going to be discussed when the Congress is in ______again next spring.
A. assembly
B. session
C. conference
D. convention
单项选择题
As a salesman, he works on a(n) ______ basis, taking 10% of everything he sells.
A. income
B. commission
C. salary
D. pension
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