Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.
| A．producing | B．having been produced |
| C．to be produced | D．produced |
I suggested to my father that we ____________ to Dalian for a holiday this summer, but the expression on his face suggested that he ___________ to it.
| A．go; shouldn't agree | B．would go; shouldn't agree |
| C．go; didn't agree | D．would go; didn't agree |
According to the information from the airline, a small sinking part of the runway of the airport is _____________ for the accident.
| A．to blame | B．to be blamed | C．to blaming | D．to be blaming |
Obviously the measures taken by the local government have ______________ the solution to drinking water problems in this region.
| A．contributed to | B．referred to | C．turned to | D．devoted to |
—We want to finish the task ahead of time.
—You have to _____________, if so.
| A．speed it up | B．take it up | C．pick it up | D．turn it up |
The two men discussed and came to ____________ conclusion that the helicopter would take _______________ place of the car some day.
| A．/; / | B．a; the | C．a; / | D．/; the |