exercises on object pronouns (me, you, him, her, us, the,,...) only:
http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns4.htm
http://www.myenglishpages.com/site_php_files/grammar-exercise-object-pronouns.php
http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns3.htm
https://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?02
http://www.english-4u.de/pers_pronouns_ex1.htm
http://www.english-4u.de/pers_pronouns_ex3.htm
http://www.english-4u.de/pers_pronouns_ex4.htm
http://www.english-4u.de/pers_pronouns_ex5.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1965
http://www.english-4u.de/pers_pronouns_ex6.htm
exercises on subjecct and object pronouns
http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns5.htm
http://www.ecenglish.com/learnenglish/lessons/pronouns-elementary-level-students
https://learnenglish.britishcouncil.org/en/english-grammar/pronouns/personal-pronouns
http://www.english-4u.de/pers_pronouns_ex2.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=7233
http://www.englishexercises.org/makeagame/viewgame.asp?id=2842
