Who is it______have the most important role to play in stopping Yellow River erosion?
A,who B.that C.which D.whom
I could see a car________，but couldn't make out what color it was.
| A．at the distance |
| B．in the distance |
| C．off the distance |
| D．from the distance |
You can take anything from the shelf and read, but please________the books when you've finished with them.
| A．put on |
| B．put down |
| C．put back |
| D．put off |
After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys ________to go to school.
| A．to be encouraged |
| B．been encouraged |
| C．being encouraged |
| D．be encouraged |
There's a man at the reception desk who seems very angry and I think he means ________trouble.
| A．making |
| B．to make |
| C．to have made |
| D．having made |
I often see lights in that empty house. Do you think I________report it to the police?
| A．should |
| B．may |
| C．will |
| D．can |