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
What authors do you like Shakespeare is ____________.
A．favorite for me
B．my favorite
C．for me tile favorite
D．the favorite of mine
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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