If we do not deal with ________ problem caused by air pollution, our planet may no longer be ________ healthy place for us.
| A．a; the | B．a; a |
| C．the; a | D．the; the |
My father walked _____ in the room, looking as if he was thinking over something.
| A．now and then | B．up and down |
| C．again and again | D．over and over |
His proposals were _____ with cheers.
| A．greeted | B．grown | C．grasped | D．guessed |
I have a great ____ and admiration for my former English teacher.
| A．passion | B．dislike | C．contempt | D．respect |
To be well-informed, we should be _____ communicationeach otherwhat happens to us.
| A．on, for, about | B．in, for, for | C．with, by, at | D．in, with, about |
What shall we use for power when all the oil in the world has _________?
| A．given out | B．put out | C．held up | D．used up |