________the day went on, the weather turned out to be fine.
| A．Which | B．Since | C．While | D．As |
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 |
It was quite a long time_____I made it out what had happened.
| A．after | B．before | C．when | D．since |
—Bruce was killed in a traffic accident.
—_____I talked with him yesterday morning!
| A．What a pity! | B．I beg your pardon? |
| C．Sorry to hear that. | D．Is that so? |