The second volume of Grade One Chinese will tell you how to ensure environmental sanitation.

1 Don't throw rubbish everywhere when you go out. When you throw the garbage into the trash can, classify it, put the scraps of paper from bottles and cans into the recyclable trash can, and throw the plastic bags into the non-recyclable trash can.

Don't scribble on the wall.

Don't spit everywhere.

Don't destroy the flowers and trees on the roadside.