She likes to use words ____ is clear to him.
| A．of which the meaning | B．of which meaning |
| C．whose of meaning | D．meaning of which |
Before he went abroad，he spent as much time as he _____ English.
| A．could learning | B．learned | C．to learn | D．could learn |
______ is it _____ has made Peter _____ he is today?
| A．What; that; that | B．That; that; what | C．What; what; that | D．What; that; what |
If _____ carefully, the experiment will be successful.
| A．do | B．does | C．done | D．doing |
It would be a good idea to use a plastic bottle, ___cut off, as a container to grow young plants in.
| A．of which the top | B．the top is | C．top of which | D．with its top |
The judge paid no attention to _____ he had just lost his wife.
| A．that | B．which | C．what | D．the fact that |