单项选择题

In his ______ to further his knowledge of the universe, man has now begun to explore space.

A. endeavor
B. expedition
C. trail
D. chase
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单项选择题
Part of the lake has been polluted. You can see the water is covered with ______ oil.
A. a coat of
B. a story of
C. a film of
D. a pad of
单项选择题
Applications have poured in ______ assignments to remote regions of the country.
A. requiring
B. begging
C. requesting
D. awaiting
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