Exercise 1

 2. the worst

 3. the biggest

 4. the cutest

 5. the most dynamic

 6. the most expensive

 7. the farthest or the furthest

 8. the funniest

 9. the best

 10. the happiest or the most happy

 11. the hottest

 12. the most important

 13. the most intelligent

 14. the most interesting

 15. the lowest

 16. the nicest

 17. the noisiest or the most noisy

 18. the most practical

 19. the warmest

 20. the most wonderful

  Exercise 2

  2. Mexico City…the newest

 3. New York City…the longest

 4. Toronto…the shortest

 5. the busiest…New York City

 6. Toronto…the lowest

 7. Toronto…the most expensive(or Mexico City…the least expensive)

 8. the cheapest…Mexico City

  Exercise 3

  2. the newest

 3. the most beautiful

 4. the easiest

 5. the biggest

 6. the least comfortable

 7. the fastest

 8. the coolest

 9. the hottest

 10. the most convenient

 11. the most interesting

 12. the least dangerous

 13. the most historic

 14. the most crowded

 15. The most efficient

 16. the most dangerous

 17. the least expensive

 18. the quietest or the most quiet

  Exercise 4

  interesterest à most interesting

 friendlier à friendliest or most friendly

 a most beautiful à the most beautiful

 most hot à hottest

 baddest à worst

 most fast à fastest

 convenicentest à most convenicent