Sure! Here are the rewritten sentences that retain the original meaning:

1. It's approximately 8 km from Phuc Yen town to Ha Noi. **Isn’t it?**
2. Last year, I attended the Hai Luu Buffalo Fighting Festival with my parents. **Didn’t I?**
3. The Robinsons visited Ho Chi Minh City a few weeks back. **Didn’t they?**
4. She purchased a variety of gifts for her friends. **Didn’t she?**
5. My trip to Nha Trang was extremely enjoyable. **Wasn’t it?**
6. Lan has placed the poster on the wall. **Hasn’t she?**
7. They had lunch with their friends at a famous restaurant. **Didn’t they?**
8. It’s around two kilometers from here to the bus stop. **Isn’t it?**
9. People in South America celebrate Carnival in various ways. **Don’t they?**
10. My father was in Ha Noi three weeks ago. **Wasn’t he?**
11. They flew to the USA last month. **Didn’t they?**
12. Viet prefers not to visit my house due to having too many assignments. **Doesn’t he?**
13. The blue dress costs 120 thousand dong. **Doesn’t it?**
14. Nam and Minh played badminton together last month. **Didn’t they?**
15. She visited the doctor because she was experiencing a headache. **Didn’t she?**
16. He makes a hundred pounds every week. **Doesn’t he?**
17. They departed from the country in 2000. **Didn’t they?**