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 |
Try to put the candidate ____ by being friendly and informal.
| A．with confidence |
| B．by heart |
| C．in peace |
| D．at ease |
—Why can your neighbor know so much about London?
—He ____ have been there before.
| A．must | B．can | C．should | D．need |
The new teacher made a good ____ on the students by her rich knowledge and humorous talk.
| A．feeling | B．effect | C．impression | D．expression |
My parents live in a small village. They always keep candles in the house ____ there is a power out.
| A．if | B．unless | C．in case | D．so that |
—What do you think of his opinion?
—Nobody has given me _____ piece of advice.
| A．a better |
| B．a best |
| C．the best |
| D．the better |