—May I go outside and play for a while, Dad?
—No, you can’t ____ your homework is being done.
| A．until | B．as | C．before | D．the moment |
There are hundreds of islands ______ the coast Fujian, the biggest of ______ is not far from the main land.
| A．on; which | B．off; them |
| C．off; which | D．on; them |
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 |