She is a ____ observer of slight differences in accents.
A. common
B. peculiar
C. subtle
D. plentiful
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The cost of the material is ____ in the bill for the work.
A. dismissed
B. excluded
C. rejected
D. discovered
She might have been at the meeting, but nobody ____ her there.
A. looked
B. noticed
C. remarked
D. commented
_____ good engineer he is!
A. how
B. what a
C. what
D. how a
"deteriorate "（）
A.become worse in quality or condition.
B.make others become happy
C.throw the rubbish
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