OBJECT PRONOUNS

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.agendaweb.org/grammar/pronouns-objects.html

http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns3.htm