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．gear
D．guarantee
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单项选择题
They agreed to leave the hill and to remove the ________homes on Sunday.
A．flowing
B．mobile
C．unstable
D．drifting
单项选择题
We were pleased to note that the early morning delivery didn't ________to the traffic jam of the busy city.
A．aid
B．amount
C．add
D．attribute
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