Not all insects are pests; in fact, a great many of them are ____ to man.[ ]

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Not all insects are pests; in fact, a great many of them are ____ to man.[     ]
A. benefit
B.beneficent
C. beneficial
D.beneficially

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举一反三

He was          in the accident.[     ]
A. unabled
B. disabled
C. abled
D. capable

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The job is to me because I have little experience, however, it is also .[ ]
A. challenging; rewarding
B. challenged; rewarded
C. challenging; rewarded
D. challenged; rewarding

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I find this treatment is very            to my health.    [     ]
A. advisable
B. invaluable
C. beneficial
D. worthy

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The          part of his speech inspired everyone present.      [     ]
A. later
B. latter
C. late
D. latest

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The medicine did not achieve the       effect.[     ]
A. supposed
B. thought
C. believed
D. desired

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