http://www.perfect-english-grammar.com/comparative-adjectives-exercise-1.html
https://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises
http://www.englishexercises.org/makeagame/viewgame.asp?id=2065
http://www.myenglishpages.com/site_php_files/grammar-exercise-grammar-comparatives-superlatives.php
http://www.language-worksheets.com/comparative-adjectives-elementary.html
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