About 187 passengers were reported _____ the shipwreck which happened last month.
A.to have been survived B.having survived
C.to have survived D.to survive
Once new difficulties ________in your work, it’s always important to use your brains.
A.arise B.raise C.arouse D.rise
--How are your recent trip to Sichuan?
—I’ve never had ______ one before.
A.a pleasant B.a more pleasant
C.a most pleasant D.the most pleasant
Shy people often avoid situations would force them into close contact with other people．
A．which B．where C．when D．what
—How long do you think it will be______ man can finally solve the problem of cancer?
—Well，it depends
A．when B．until C．after D．before
______ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking.
A.As B.It C.What D.Which
