－The accident might not have happened had we been more careful．
－But we _____ at that time．
| A．don’t | B．didn’t | C．hadn’t | D．weren’t |
As far as I know, he is seldom, ______, absent from school.
| A．if any | B．if so | C．if ever | D．if not |
--- Would you mind if I smoked here?
---I am afraid…, but if you________.
| A．will | B．must | C．would | D．may |
How long do you suppose it is ___________ he arrived there?
| A．when | B．before | C．after | D．since |
---Will you join us in the game?
---Thank you,_________ .
| A．but why not | B．but I’d rather not |
| C．and I won’t | D．and I’ll join |
So many years have passed and the terrifying accident is still ______in her mind.
| A．new | B．different | C．fresh | D．violent |