__________, we'll come to see you again.
| A．If time will permit | B．Time permits |
| C．Time permitting | D．Time permitted |
It was in the lab _____ was taken charge of by Professor Zhang ______ they did the experiment .
| A．where; that | B．which; where |
| C．that; where | D．which; that |
There was ______ time ______ I hated to go to school .
| A．a; that | B．a; when |
| C．the; that | D．the ; when |
He made another wonderful discovery, ______ of great importance to science.
| A．which I think is | B．which I think it is |
| C．which I think it | D．I think which is |
When they met again, the two friends talked about lots of things and persons ______.we could remember in the school.
| A．who | B．whom | C．that | D．which |
The factory ______ I am going to is the place ______ my mother used to work many years ago.
| A．where, where | B．where, which |
| C．which, where | D．that, which |