http://www.myenglishpages.com/site_php_files/grammar-exercise-object-pronouns.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=1965
http://a4esl.org/q/h/9901/jd-pronouns.html
http://www.englishmaven.org/HP6/Pronouns%20Exercise%201.htm
http://www.montsemorales.com/gramatica/Objectpronoun.htm
http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns3.htm
https://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?02
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-13991.php
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