http://www.eflnet.com/tutorials/muchmanyalotof.php
http://perso.ya.com/mjandres/archivos/muchmany&alotof.htm
http://www.myenglishpages.com/site_php_files/grammar-exercise-many-lot.php
http://www.agendaweb.org/exercises/grammar/countable-uncountable/how-many-much
http://www.englisch-hilfen.de/en/exercises_list/mengen.htm
http://www.languageguide-online.com/quantifiers-much—many—a-little—a-few—a-lot-of.html
http://www.risorsedidattiche.net/inglese/grammatica/inglese_grammatica_many_much.php