—He _____ to the meeting. Have you informed him of it?
—Sorry. I _____ to.
| A．hasn’t come; am going |
| B．didn’t come; have forgotten |
| C．hasn’t come; forgot |
| D．doesn’t come; will have |
Finding information on the Internet is easy. The ______ is how you can tell whether the information is useful or not.
| A．ability | B．competition |
| C．challenge | D．knowledge |
You’d better have your room ______. It’s ______.
| A．clean; in mess | B．clean; in a mess |
| C．cleaned; in mess | D．cleaned; a mess |
The condition prevents the blood from freely.
| A．circulating | B．spreading |
| C．flowing | D．circling |
— You have spoken to your mother in a rude manner.
— I admit I was wrong, but she read my diary without my permission.
| A．shouldn’t | B．mustn’t |
| C．needn’t | D．won’t |
They met with a lot of difficulties in building the railway in Tibet, but they _____until it was completed.
| A．carried on | B．put on |
| C．carried out | D．put out |