http://www.englishexercises.org/makeagame/viewgame.asp?id=6009
http://www.myenglishpages.com/site_php_files/grammar-exercise-grammar-comparatives-superlatives.php
http://anthonyhalderman.com/english/compsup.htm
http://jerome.boulinguez.free.fr/english/file/hotpotatoes/comparativesandsuperlatives.htm
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