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
As electric lines were destroyed by the storm, they were forced to ________ light for several days.
A．go over
B．go in for
C．go without
D．go out
单项选择题
It was ________ that we felt tired when we arrived.
A．a so long travel
B．such a long travel
C．such a long journey
D．such a so long journey
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