Here are the filled-in sentences with the appropriate forms of the words in brackets:

1. Iceland is considered the most **peaceful** country in the world. (peace)
2. A **nomadic** lifestyle has its advantages and disadvantages. (nomad)
3. My brother has been a stamp **collector** for several years. (collect)
4. It is an **inconvenient** place to hold a picnic because it is too far from the road. (convenience)
5. Drinking water in some areas may be **unsafe**. (safe)
6. During my stay in the village, I was **friends** with several local farmers. (friend)
7. Encouraging children to eat and drink **healthily** is very important. (health)
8. Local people in the village often wear their **traditional** costumes during the festivals. (tradition)
9. Please give **generously** to that charity to help the homeless after the flood. (generous)
10. The baby slept very **soundly** because the bed was really comfortable. (sound)
11. There is a **collection** of books on the shelf. (collect)
12. There is a **convenience** for people in remote areas to get to hospitals. (convenience)
13. He is very **skillful** with his hands. (skill)
14. It is said that water collected from the local streams is **unsafe** to drink. (safe)
15. We want **friendly** relations with all countries. (friend)