12. The police the crowd in case anything happened.

esk that ____ clean so I could do homework was always surrounded with bowls of bad milk, old magazines and so on.

Only after spending several nights working on the math problem to wonder whether the problem was wrongly set.

下列各句中加点的成语使用不恰当的一项是( )

What’s the matter with you, Sandy–I’m _____ a bad cold. I think I am dying.