单项选择题

She has become quite ______ to the company.

A．influential
B．compulsory
C．indispensable
D．essential
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单项选择题
To survive in the intense trade competition between countries, we must ______ the qualifies and varieties of products we make to the world market demand.
A．improve
B．enhance
C．guarantee
D．gear
单项选择题
It is no ______ that his car was seen near the bank at the time of the robbery.
A．coincidence
B．inspiration
C．correspondence
D．intuition
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