Ответ:

1. C
2. B
3. C
4. A
5. C
6. B
7. A
8. B
9. B
10. C
11. A
12. C

1. +
2. more fluently
3. quieter
4. the most beautifully
5. quickly as
6. the most important
7. more elegantly
8. the tallest
9. colder
10. more carefully