http://www.grammar.cl/Games/Comparatives_Superlatives.htm
http://www.softschools.com/quizzes/grammar/adjectives/quiz328.html
http://www.better-english.com/grammar/comparatives.htm
http://www.eflnet.com/grammar/comparisons.php
http://www.better-english.com/grammar/comp2.htm
http://speakspeak.com/a/html/d3a21_english_grammar_practice_comparatives.htm
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises
http://www.englishexercises.org/makeagame/viewgame.asp?id=6009
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