1. 1. fast - faster - the fastest
2. heavy - heavier - the heaviest
3. dangerous - more dangerous - the most dangerous
4. small - smaller - the smallest
5. large - larger - the largest
6. light - lighter- the lightest
7. rare - rarer - the rarest
8. common - more common - the most common
9. bad - worse - the worst
10. good - better - the best
2. 1) Cats are more popular than snakes as pets.
2) Pigs are more intelligent than other animals.
3) Turtles are slower than crocodiles.
4) Elephants are heavier than pigs.
5) Bears are rarer than snakes.