Here are the word forms needed to complete the sentences:

1. Baking cakes is an interesting **activity** for me all the time. (act)
2. He finds playing board games every **relaxation**. (relax)
3. I think that designing models is very **exciting** in the sun. (excite)
4. She finished her lunch and then had an enjoyable experience. (**peaceful** is implied) (peace)
5. Living in the countryside can be a **design** jewelry. (design)
6. They spent lots of time **relaxing**. (relax)
7. The boy sings the song in the 2023 Hiền Lương Village Tet Festival next Saturday. (**celebration** is implied) (celebrate)
8. Come and **design** the 2023 Hiền Lương Village Tet Festival next Saturday. (design)
9. There are many **activities** around the world but I admire Calvin Klein most. (act)
10. He is not a very **relaxed** person. (relax)
11. Baking on the weekends makes her **enjoyment**. (enjoy)
12. When is the cycling **competition**? (compete)
13. The evening was **nature** spent talking and dancing. (nature)
14. She has lived in England for 2 years, so she can speak English **naturally**. (nature)
15. I couldn’t sleep well yesterday because the neighbors sang karaoke **noisily**. (noise)
16. They lived **peacefully** until they passed away. (peace)
17. It is one of the most **interesting** films I have ever seen. (interest)
18. I prefer using **natural** ingredients in my cooking to make healthier meals. (nature)
19. I would like to **live** in the country. (life)
20. Arts and crafts are fun. I really enjoy designing jewelry. (**enjoyment** implied) (enjoy)

Feel free to ask if you need more help!