Carbon
dioxide from burning fuels is the most common of the so-called greenhouse gases.
| A．produced | B．producing | C．to be produced | D．having been produced |
He told us whether_____a picnic was still under discussion.
| A．to have | B．having | C．have | D．had |
David threatened______his neighbour to the police if the damages were not paid.
| A．to be reported | B．reporting | C．to report | D．having reported |
Bill suggested_____a meeting on what to do for the Shanghai Expo during the vacation.
| A．having held | B．to hold | C．holding | D．hold |
I suggested the person______to be put into prison.
| A．refers | B．referring | C．referred | D．refer |
Be quick! There are only ten minutes_____.
| A．to remain | B．remained | C．remaining | D．to leave |