Adjectives

https://agendaweb.org/exercises/grammar/comparison/comparison-write-2
https://agendaweb.org/exercises/grammar/comparison/comparison-write-3
http://suz.digitaleschulebayern.de/english/grammar/comp1.htm
https://www.english-4u.de/en/grammar-exercises/comparison.htm
http://englishgrammarexercise.com/comparison-adjectives-using-as-as-exercise-1/
http://www.focus.olsztyn.pl/en-adjective-phrases-exercises.html#.W-0BVegzZPY