Her washing machine needs __.
A. to repair
B. repaired
C. being repaired
D. repairing
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Will he participate __________ the coming Art Festival?
A. in
B. on
C. at
D. with
the result of his experiments was unsatisfactory, Professor Smith decided to continue the research.
A. Unless
B. Since
C. If
D. Although
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
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