__________ you are old enough to judge things, you should decide your path in life.
| A．Since | B．In order that | C．Though | D．Unless |
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 Diaoyu Island Dispute last weekend and that was the first time Iabout 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 |