________ the sales figure of the new range of products is relatively small, the potential market is large.
A.Unless B.After C.Since D.While
He missed the worst of the traffic this morning, ______ he set out before 6 o’clock.
A.but B.so
C.for D.or
Some pressure is good for you ________ it can help you try harder.
A. unless B. although
C. before D. as
How long do you suppose it is ______ he arrived there?
A.when B.before
C.after D.since
Dad thinks I should study to be a doctor，____ I’m not interested in medicine.
A.so B.and C.but D.for
He smiled politely Mary apologized for her drunken friends.
A.as B.if
C.unless D.though
