单项选择题

Without a (an) ______ passport a tourist is forbidden to enter a country.

A. operative
B. effective
C. valid
D. efficient
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单项选择题
In ancient times people who were thought to have the ability to ______ dreams were likely to be highly respected.
A. impart
B. inherit
C. interpret
D. intervene
单项选择题
To survive in the intense market competition, we must ______ the qualities and varieties of products we make to the world-market demand.
A. improve
B. guarantee
C. gear
D. enhance
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