Sarah had her purse stolen the day before yesterday when she was knocking about in a park, ______________?
| A．wasn’t she | B．weren’t they | C．hadn’t she | D．didn’t they |
I’m sorry to tell you that we decided __________ your plan.
| A．to abandon | B．abandoning | C．to quit | D．quitting |
They are going to find a new approach ______these complex problems.
| A．to solving | B．to solve | C．in solving | D．solves |
I'm afraid that I can't make myself _______ because of my poor English.
| A．understand | B．understanding | C．to understand | D．understood |
That dog ought to be destroyed ______it attacks any more children.
| A．until | B．since | C．after | D．before |
The library needs __________, but it’ll have to wait until Sunday.
| A．cleaning | B．be cleaned | C．clean | D．being cleaned |