http://www.myenglishpages.com/site_php_files/grammar-exercise-countable-uncountable-nouns.php
http://www.montsemorales.com/gramatica/CountableSpot1-6.htm
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/count2.htm
http://www.learn-english-online.org/Lesson36/countuncount.htm
http://www.ecenglish.com/learnenglish/lessons/coutable-uncountable-nouns
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