1. is
2. travels
3. moves
4. seems to change
5. doesn't change
6. has
7. see
8. see
9. reflects
10. can see
11. light
12. turns
13. light
14. turns
15. is
16. is
17. appears to have
18. want to learn
19. used
20. to look
21. couldn't see
22. was invented
23. used
24. to study