—Is Alice still performing?
—I'm afraid not. She is said _______ the stage already as she has become a director.
| A．to have left | B．to leave |
| C．to have been left | D．to be left |
---- Which of these digital cameras do you like best?
---- ______. They are both expensive and of little use.
| A．None | B．Neither | C．Nothing | D．No one |
We work together to achieve our common purpose: ____ world that is safer, cleaner and healthier than ____ one we founded.
| A．the; the | B．a; 不填 | C．a; the | D．the; 不填 |
— Are you pleased with what he has done?
— It couldn’t be____. Why didn’t he put more effort into his work?
| A．any worse | B．much better | C．so bad | D．best |
Because of the heavy snow, we had to delay the visit until this weekend to the artgallery ____ in the center of our city these days.
| A．being held | B．holding | C．to be held | D．held |
While watching television, ____.
| A．the doorbell rang | B．we heard the doorbell ring |
| C．there was someone knocking at the door | D．the doorbell was ringing |