While building a tunnel through the mountain, ________ .
| A．an underground lake was discovered |
| B．there was an underground lake discovered |
| C．a lake was discovered underground |
| D．the workers discovered an underground lake |
It’s high time we ________ effective ________to improve your working conditions.
| A．take;means | B．made;measures | C．took;measures | D．do;actions |
It’s really very dangerous.One more step,________the baby will fall into the well.
| A．or | B．so | C．and | D．but |
Let me have a rest,________?
| A．do I | B．don’t I | C．shall I | D．may I |
Open a window,________?
| A．wouldn’t you | B．won’t you | C．would you | D．don’t you |
Don’t make so much noise,________?
| A．will you | B．won’t you | C．shall we | D．do you |