http://www.learnenglish-online.com/grammar/tests/superlativecomparative.HTML
http://www.english-zone.com/spelling/comp5.htm
http://www.learnenglishfeelgood.com/english-comparative-superlative1.HTML
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises
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