It was quite a serious accident, ________caused by careless driving.
| A．which I think was | B．I think which was |
| C．which I think it was | D．I think which it was |
Over the past 20 years, the Internet helped change our world in _____way or another for the better.
| A．any | B．one | C．every | D．either |
Try on this red skirt; you will look great _____it.
| A．on | B．by | C．in | D．for |
—Do you want another drink? 
——_______ .
| A．I don’t think so | B．No way | C．Not at all | D．I wouldn’t say no |
he doctor recommended that you______ swim after eating a large meal.
| A．wouldn’t | B．couldn’t | C．needn’t | D．shouldn’t |
—Is there any possibility ______ you could pick me up at the airport ? 
—No problem
| A．when | B．that | C．whether | D．what |