David suddenly realized that the waiter was the same man _____ face he had seen in a painting many years ago．
| A．which | B．that | C．of whom | D．whose |
__________you keep on trying ,I don’t really mind whether you can come top in your class.
| A．So long as | B．As soon as | C．Once | D．The moment |
What a pity! I missed meeting my boss at the airport because my car was ___in the traffic jam．
| A．broken up | B．kept away | C．held up | D．kept up |
The medicine works more effectively ______ you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |
I don’t understand what the engineer means, but I’ve got ____rough idea of ___ project plan.
| A．the; a | B．不填; the | C．the; 不填 | D．a; the |
Could it be in the room _________ we had a talk last night ___________ you left your keys ?
| A．that; where | B．in which; where | C．where ; that | D．where ; where  |