Choose the correct answer

Here are the answers to the questions in the provided image:

11. A. more hard
12. C. harder
13. C. harder
14. C. than
15. A. more densely populated
16. A. more densely populated
17. C. D. together
18. B. both A & C
19. C. farther
20. B. distance
21. A. urban
22. C. noisier
23. C. easier
24. A. harder
25. B. the hardest
26. B. more interesting
27. A. colder
28. B. colder
29. A. more comfortable
30. D. comfortably
31. C. narrower
32. A. more careful
33. B. than (correct)
34. A. flatter
35. C. larger
36. D. longest

If you have any specific questions or need further assistance with any of the answers, feel free to ask!