The university library has a large ______ of books.
A. to vary
B. various
C. variety
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They are ______ that the river would flood.
A. fearful
B. terrible
C. awful
D. crazy
Fresh air is ______ to good health.
A. fundamental
B. elementary
C. basic
D. important
The most ______ thing in this is that one is not allowed to use his native language on his native land.
A. laughable
B. ridiculous
C. funny
D. reasonable
His instructions were too difficult to understand, so he had to ______ them.
A. satisfy
B. simplify
C. classify
D. terrify
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