Whenever I was in trouble, he would do what he could _____ me.
| A．help | B．helping | C．to help | D．helped |
The person we talked about ____ our school last week．
| A．visiting | B．will visit | C．visited | D．has visited |
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 |