A sign prohibiting littering on the roof.

1. Observe social morality and maintain public health.

There is only one earth. It is my duty to protect her.

3, strive to be a civilized person, garbage is no longer a cloud.

If you want to bring spring scenery into your home, you can't help becoming a flower.

5. Pick up our civilization with both hands.

6. A harmonious city is my home, and a beautiful environment depends on everyone.

7. Care for our homeland with beautiful hearts.

8, a piece of paper and a small piece of scenery, every move is civilized.

9. If we want to build a bright future, we must start from protecting the environment, and protecting the environment must start from the garbage not falling to the ground, and everyone should start from the garbage not falling to the ground.

10 I'm Snow White, please don't get my clothes dirty.

1 1. We are both garbage makers and environmentalists who remove garbage.

12 We are all a family, and it is our responsibility to protect the earth.

13. In order to make our home beautiful, we created it with our hands.

14 Please contribute your strength to the earth.

15, Tian Xingjian, a gentleman should start with caring for garbage.

16, it's a pity to step on the green carpet. There is no harm in having more stars.