Traffic restrictions have come into effect in Beijing to improve the
capital’s air quality and traffic situation for the 2008 Olympics．
| A．in order that | B．in an attempt | C．at an attempt | D．in a try |
His sister left home in 1998，and ________ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
In the near future，more advances in the robot technology ________ by scientists.(2011·湖南)
| A．are making | B．are made |
| C．will make | D．will be made |
John, a friend of mine, who got married only last week, spent $3,000 more than he ________ for the wedding.
| A．will plan | B．has planned |
| C．would plan | D．had planned |
—Hurry up！Alice and Sue are waiting for you at the school gate.
—Oh！I thought they ________ without me.
| A．went | B．are going |
| C．have gone | D．had gone |
We arrived at work in the morning and found that somebody ________ into the office during the night.(2011·江西)
| A．broke | B．had broken |
| C．has broken | D．was breaking |