www.uv.mx/tecaprendizaje/material/cursoenlinea/Mary/Grammar/Countable%20and%20Unc%20Nouns/Countable%20and%20uncountable/countable_and_uncountable_nouns.htm
http://www.1-language.com/englishcourse/unit9_grammar_exs.htm
http://www.englishclub.com/grammar/nouns-un-countable.htm
http://www.learn-english-online.org/Lesson38/Lesson38.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1979#a
http://www.slideshare.net/begonya297/countable-and-uncountable-nouns-presentation
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