Here are the adverbs in their comparative form:

1. badly - worse
2. conveniently - more conveniently
3. early - earlier
4. far - farther/further
5. fast - faster
6. fluently - more fluently
7. happily - more happily
8. hard - harder
9. slowly - more slowly
10. well - better
11. late - later
12. smartly - more smartly
13. responsibly - more responsibly
14. patiently - more patiently
15. generously - more generously
16. cleverly - more cleverly
17. quickly - more quickly
18. suitably - more suitably
19. beautifully - more beautifully
20. strongly - more strongly

Feel free to ask if you need more help!