1. Please all the papers from the floor.

2. Why is there so much in the park?

3. We should the paper we use at school.

4. It my parents when my room is untidy.

5. Your room is a . Tidy it immediately!

6. Could I please have a of fruit juice?

7. The opposite of dirty is .

8. We all want to live in a environment.

9. Cars and buses cause air .

10. There are chewing-gum all over the floor.