______the road ,don’t forget to look both ways.
| A．As crossing | B．While you cross |
| C．While crossing | D．Cross |
_______ to the sunlight for too long will do harm to your skin.
| A．Exposing | B．Exposed | C．Being exposed | D．Having exposed |
--- Congratulations!
---Thank you. If it hadn’t been for your help, we ____ in the experiment.
| A．will never succeed | B．wouldn’t have succeeded |
| C．mustn’t have succeeded | D．can’t have succeeded |
---You _________to our Mom like that. It was awfully impolite.
---You are right. I must have been crazy at that moment.
| A．mustn’t have talked | B．needn’t have talked |
| C．shouldn’t have talked | D．may not have talked |
Electric trains have now _______ steam trains in England.
| A．taken place | B．in place of | C．instead of | D．taken the place of |
The boy suggested that Tom ______ the problem another way, and Tom’s expression suggested that he_________.
| A．should solve; agreed | B．solve; agree | C．solved; should agree | D．solved; agreed |