What do you thinkher a good pupil?

Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to do it.

Don’t bring food to the library, or your teacher will ______.

Chongqing is ____________ lively city with many places to have fun.

Are two students enough to help you carry the desk?— No, the desk is too heavy. I need ______ two.