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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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

单项选择题

Maria has blisters in her boots. She ______ walking such a long distance.

A. was used not to
B. used to
C. is not used to
D. did not used to

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