Why didn't you tell me there was no meeting today? I all the way here through the heavy snow.
| A．needn't have driven | B．can't have driven |
| C．mustn't have driven | D．shouldn't have driven |
We can’t continue to pretend that the problem of pollution doesn’t___________in this city.
| A．exist | B．live | C．be | D．survive |
We must do whatever we can to ______the river from being polluted any more.
| A．separate | B．keep | C．prevent | D．guard |
We should try our best to___________ those people after the disaster.
| A．break out | B．come on | C．bring up | D．cheer up |
— I’d like to take a week holiday.
— ________, we are too busy.
| A．Don’t worry | B．Forget it | C．Don’t mention it | D．Pardon me |
---Are you going to attend the meeting _____ next Saturday?
---I won’t unless invited.
| A．being held | B．held | C．will be held | D．to be held |