the result of his experiments was unsatisfactory, Professor Smith decided to continue the research.
A. Unless
B. Since
C. If
D. Although
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We’ll let you use the room you keep it clean and tidy.
A. as long as
B. in case
C. however
D. though
He explained the problem to the students who ____________.
A. have confused about it
B. have been confused about it
C. had confused by it
D. had been confused by it
All I can ______ is to see this part of your life as the beginning of a wonderfuljourney.
A. introduce
B. recommend
C. reflect
D. comment
It is decided that no smoking in public places from now on.
A. be allowed
B. is allowed
C. will be allowed
D. should have been allowed
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