---The window must have taken you quite a lot of time that day.
--- You are right. They ________ for weeks.
| A．haven’t been cleaned | B．hadn’t been cleaned |
| C．didn’t’ clean | D．haven’t cleaned |
The life he is now used _____ quite different from ours.
| A．is | B．to be | C．to being | D．to is |
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 |