Once you have started a job, you should do it in ( ).
A. practice
B. theory
C. earnest
D. hurry
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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
The earliest skis were ( ) ,consisting of short boards covered in fiir skins.
A. crude
B. coarse
C. rude
D. rough