11. Write what you think people must or mustn't do
1. People mustn't dump their wastes in forests.
2. People recycle things.
3. People help endangered species to survive.
4. People pollute rivers and oceans.
5. People destroy animals' habitats.
6. People make laws to protect nature.
7. People cut down a lot of trees.
8. People hunt animals for fun.
9. People turn rivers into dumps.
10. People protect wildlife on the Earth.​