Ответ:
1. c
2. b
3. a
4. c
5. c
6. a
uglier - the ugliest
more famous - the most famous
shorter - the shortest
more polluted - the most polluted
busier - the busiest
more miserable - the most miserable
angrier - the angriest
better - the best
more popular - the most popular
more enjoyable - the most enjoyable
more exciting - the most exciting
more important - the most important