http://www.eflnet.com/tutorials/adjcompsup.php
http://www.ucalgary.ca/UofC/eduweb/grammar/course/speech/1_4d.htm
http://www.stclaresenglish.net/langprac/compstu1.htm
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises
http://people.hofstra.edu/Ilaria_Marchesi/exercises2/ch_27_3.htm
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