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
______ before, his first performance for the amateur dramatic group was a success.
A．Though having never acted
B．As he had never acted
C．Despite he had never acted
D．In spite of his never having acted
单项选择题
The crippled Jack proudly walked with a ______ to the platform to join the children.
A．jump
B．limp
C．hop
D．jog
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