The air pollution is very serious,we should take___________to stop it.

—Could you tell me what’s the ___ of it?— Well, it’s an oval.

 This is _______book. They like it very much.

 If（如果）Millie enjoys many kinds of stories and comic books, She should go to  _______ .

---Why didn’t you go there with __________?  --- I wanted to be alone.