Here are the suitable forms of the words to fill in the blanks:

1. It's important to **protect** the environment by properly disposing of waste. (PROTECTION)
2. **Polluted** air and water can have negative effects on wildlife and ecosystems. (POLLUTE)
3. Be careful with those chemicals; they are **dangerous** if not handled properly. (DANGE)
4. Using energy-efficient appliances can help save **electricity** and reduce your bills. (ELECTRIC)
5. Poor air quality can have serious **health** issues for people living in cities. (HEALTHY)
6. Some household products contain **poisonous** chemicals that can be harmful if ingested. (POISON)
7. Remember to **prevent** pollution by choosing eco-friendly transportation options. (REVENTION)