______the bones under the sand，the scientists concluded that they came from the dinosaurs about 65 million years ago．
A．Being inspected B．Inspected
C．Having inspected D．To inspect
She is a quiet girl at school，but sometimes she _____be very naughty．
A．should B．would C．can D．will
Shy people often avoid situations _____would force them into close contact with other people．
A．where B．which 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
I listened to a report about the Diaoy
u Island Dispute last weekend and that was the first time I about the subject．
A．have heard B．had heard C．heard D．would hear
--------Is it all
right if I smoke here?
------- _______，sir．This is a non-smoking section．
A．No way B．Go ahead C．Better not D．As you please
