Scientific experiments __________ by students without the teachers’ instructions can be dangerous

I think I’m ____ to go back to work.—I’m afraid not. You must stay in bed for two more days.[ ]

Bad weather! It’s blowing outside. —-You’d better stay at home, dear.

You’re fortunate enough to escape fordrunken driving, but don’t drink again.

You know a lot about Chinese history, don’t you –Yes, I China for a long time since 1998.