Steps must be taken ______this kind of disaster will never happen again.
| A．because | B．even if | C．as | D．so that |
Start out right away, _____ you’ll miss the first train.
| A．and | B．but | C．or | D．while |
It is very hard for Mary to work there, for ____ she does can’t satisfy her boss.
| A．what | B．whatever | C．which | D．whichever |
-Where did you find your wallet?
-It was in the shop ____ I bought the shirt.
| A．that | B．where | C．which | D．there |
What do you enjoy ____ your spare time?
| A．kill | B．to kill | C．killing | D．killed |
The workers were working from 7:00 a.m. to 7:00 p.m. that day, only ____ once at noon to have their lunch.
| A．to stop | B．stopping |
| C．to have stopped | D．having stopped |