You ______ worry about their safety．They are old enough to take care of themselves.
| A．mustn’t | B．needn’t | C．can’t | D．wouldn’t |
The old house we paid a visit _____ at the top of the hill.
| A．standing | B．to stand |
| C．to standing | D．to stands |
Nothing that he suggested _____ to be of any use.
| A．prove | B．proved | C．proving | D．to prove |
What the boy enjoys _____ to have a room of his own.
| A．being | B．to be | C．is | D．are |
Which do you enjoy ____ your weekend, swimmingorfishing?
| A．spending | B．being spent |
| C．spend | D．to spend |
I think this is the very work that we must finish ____ her.
| A．to help | B．help |
| C．helping | D．helped |