The police came running and the crowd.
| A．broke off | B．break into |
| C．broke up | D．break down |
—What shall we do tonight then?
—_______ -whatever you want.
| A．Help yourself |
| B．It’s a deal |
| C．No problem |
| D．It’s up to you |
It suddenly occurred to him ________ he had left his keys in the office.
| A．whether |
| B．where |
| C．which |
| D．that |
It was a real race ________ time to get the project done. Luckily, we made it.
| A．over |
| B．by |
| C．for |
| D．against |
—How far can you run without stopping?
—_________. I’ve never tried.
| A．Don’t mention it |
| B．That’s all right |
| C．I have no idea |
| D．Go ahead |
A serious study of physics is impossible ________ some knowledge of mathematics.
| A．against |
| B．before |
| C．beyond |
| D．without |