She sold her house ___ she can't help regretting it.
A. or
B. for
C. but
D. so
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His children are well-behaved, ___ those of his sister's are very naughty.
A. and
B. whereas
C. thus
D. so
Progress so far has been very good. We are, ___, confident that the work will be completed on time.
A. therefore
B. moreover
C. however
D. nevertheless
He is a nice listener, ____ he feels the time is right he will give you his thoughts.
A. until
B. after which
C. if
D. and when
How can you keep fit ___ you smoke so much?
A. as
B. while
C. when
D. for