He paid for a seat, when he________have entered free.
| A．could |
| B．would |
| C．must |
| D．need |
A modern stadium in that new town, ________ soon, will be an ideal place for people to have all kinds of sports in.
| A．completed | B．to be completed |
| C．being completed | D．to have been completed |
________ that the Youth Olympic Games might be delayed due to severe air pollution, our government has made a promise to Jacques Rogge that they will spare no effort to settle the problem.
| A．Warned | B．Having warned |
| C．Warning | D．Being warned |
During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
| A．working | B．to work |
| C．to have worked | D．having worked |
Our waste recycling project ________ a lot of investigation and paperwork had been done by the end of last term.
| A．involved | B．to involve |
| C．being involved | D．involving |
Every morning Jack's wife will stand before the mirror, ________ carefully until she has to go to work.
| A．dressed | B．dressing |
| C．to dress | D．having dressed |