Here are suitable words to fill in the blanks:

1. We should save **natural** resources.
2. People in the country are very open and **friendly**.
3. Air **pollution** is a big problem in the city.
4. Her father soon died of a **broken** heart.
5. Every week, there are two **flights** from Ha Noi to Nha Trang.
6. We are waiting for the **arrival** of his plane.
7. Bell **successfully** demonstrated his invention.
8. Children need to have a good **education**.
9. Because of the **encouragement** of her teacher, she decided to study law.
10. Some of my **relatives** live in the countryside.