We must soon ______a new teacher to the class.
| A．adapt | B．appoint | C．exchange | D．abuse |
What a great _____ do you think a word of praise from the teacher will have on pupils?
| A．result | B．account | C．effect | D．cause |
He was told that it would be at least three more months _____ he could recover and return to work.
| A．when | B．before | C．since | D．that |
It is not who is right but what is right ____ is of importance.
| A．which | B．it | C．that | D．this |
I _____ his telephone number. Had I known it, I would have rung him up.
| A．don’t known | B．didn’t know |
| C．hadn’t known | D．haven’t known |
--- Don’t look down upon Bob. He has his own advantages.
--- Oh, yes. ____ others are weak , he is strong.
| A．When | B．Where | C．While | D．If |