1. ...are tasty but ...more tasty and ...are most tasty.
2. ...is big but Canada is bigger and ... the biggest.
3. ...is cold but ... is colder, ...is the coldest.
4. ...are friendly, ... are more friendly, ... are the most friendly.
5. ...are cute, ...are cuter..., are the cutest.
6. ...are dark, ...are darker, ... are the darkest.
7. ... are bright, ... are brighter, ... are the brightest.