On a ( ) estimate, there are now about 5,000 books or articles that deal with it,at least in part.
A. conservative
B. confidential
C. comprehensive
D. consequent
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Once you have started a job, you should do it in ( ).
A. practice
B. theory
C. earnest
D. hurry
Recent studies show that moderate amounts of alcohol are beneficial ( )health.
A. for
B. to
C. with
D. of
The ( ) between the rich and the poor becomes wider and wider nowadays.
A. space
B. opening
C. gap
D. separation
The cost of these complex operations is ( ) but poorly known.
A. considerable
B. sufficient
C. numerous
D. enormous
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