11. Fragment 12. Sentence 13. Sentence 14. Fragment 15. Fragment 16. Fragment 17. Fragment 18. Sentence 19. Fragment 20. Fragment (sorry if i get any wrong youll still have a passing grade though)
The answer is. The work describes Thoreau's thoughts over the course of a year spent immersed in the natural world.
I think the first one hope this helps
A rough draft to see where you story will go