Sure! Here are the completed sentences for both exercises:

**Exercise 4: Complete the sentence with the words in the box:**
1. boring
2. vast
3. friendly
4. nomadic
5. my father is a **brave** soldier.
6. The film was so **boring** that I fell asleep.
7. It will be very **inconvenient** for me to have no car.
8. The **vast** majority of pupils attend state-funded schools here.
9. She hoped the different ethnic groups in the area could live together in **peaceful** coexistence.
10. A **hard** life is hard but interesting.

**Exercise 6: Fill each blank with a word/phrase in the box:**
1. At the **harvest time**, my brother always helps my parents load the rice onto the truck and drives it home.
2. I often help my parents dry the **rice** in the yard in front of my house.
3. Some farmers in my village still use the **buffalo** to transport rice home.
4. He usually goes **herding** the buffaloes with other boys in his village.
5. My pen pal says he would like to visit my **countryside** at harvest time to see what farmers do.
6. My friend has never ridden a **buffalo**, so he would like to try one.
7. Harvest time is the **busiest time** of the year in the countryside.
8. Our garden is **colorful** in spring when almost flowers bloom.
9. I like looking at the stars on starry nights. It's **fantastic**.
10. My uncle lives in the city. He says it's **noisier** than my village.

Feel free to ask if you need further assistance!