His first response was to say no. Later, ________, he changed his mind.
A. still
B. or
C. however
D. and
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The days were short, _____ it was now December.
A. or
B. and
C. for
D. but
Not only you but also he ________ football.
A. like
B. likes
C. are liking
D. am liking
Give him an inch _____ he'll take a mile.
A. but
B. and
C. or
D. so
(2空)一对圆柱齿轮正确啮合的条件是:(________)和(________)。