1.You musn't throw the rubish in river
2.You must save water
3.You must teach somebody save the nature.
4.You must help janitors
5.You must help animals
6.You musn't do something which is not good for nature.
7.You musn't set a bad example
8..You musn't hunt on animals
9.You have to help keep our pollution clear
10.You must grow tress
11.You musn't throw anything in river
12You must throw batteries in special box
13.You must grow flowers
14.You musn't break trees.
15.You musn't burn grass
16.You must keep your city in purity.
17.You musn't destroy the garden
18.You musn't kill the fishes
19.You musn't smoke
20.You must follow these instructions
Я Don undestand!.