Mr. Zhang felt a little tired, ____ he still went on working.
A. but
B. and
C. so
D. or
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Our teacher is very busy, ____ he often help us with our lessons.
A. or
B. but
C. and
D. though
Tom got ill, ___ he still attended the important meeting.
A. so
B. because
C. but
D. nor
I enjoy the popular dance "hip-hop", but ___ my father ___ my mother likes it.
A. both; and
B. not only; but also
C. either; or
D. Neither; nor
Forests help to keep water from running away, _____ drought does not often happen.
A. and
B. but
C. so
D. though