Every means _________tried but without any result.
| A．have been | B．has been |
| C．are to be | D．is to be |
You _____ her in her office last Friday, she’s been out of town for two weeks.
| A．needn’t have seen | B．must have seen |
| C．might have seen | D．can’t have seen |
Our success was largely _____ the good cooperation of all team members.
| A．because | B．result from | C．due to | D．thanks to |
. In our country, it’s a practice that workers have _____ for the Spring Festival.
| A．a week off | B．a week’s off | C．a weeks’ off | D．a week leave |
They are forbidden _____, for they are still middle school students.
| A．to smoking | B．to smoke | C．smoked | D．smoke |
We have the most population in the world, most of it _____ farmers.
| A．to be | B．is | C．are | D．being |