Here are the correct words to complete each of the sentences:

1. An illness in a person, animal or plant is called **B. disease**.
2. Animals that live in a natural and free way are called **C. wildlife**.
3. A machine that cools the air is called **C. air conditioner**.
4. **B. Electricity** is a form of energy that provides power for machines, computers, TVs, etc.
5. The natural world where plants, animals, and people live is called **B. environment**.
6. To harm something or change something good into something bad is called **D. damage**.
7. **A. Pollute** means to make air, water, and land dirty and not safe to use.
8. **B. Reuse** means to use something again, e.g., a bottle, a bag.
9. To avoid using something (e.g., time, energy), or use less of it is called **A. waste**.
10. **A. Clean up** means to make a place clean and tidy.