单项选择题

He accidentally found a stock of jewelry stamps when he was packing up his books.

A. by the way
B. by chance
C. by hand
D. by nature
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He works in a sports centre instructing people in the use of the gym equipment.
A. helping
B. teaching
C. informing
D. ordering
单项选择题
John is crazy about pop music.
A. mad
B. sorry
C. concerned
D. worried
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