http://www.ecenglish.com/learnenglish/lessons/irregular-past-participle-verbs-quiz
http://speakspeak.com/english-grammar-exercises/elementary/past-participles-of-irregular-verbs
http://www.perfect-english-grammar.com/irregular-verbs-exercise-3.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=1830
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-8656.php
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