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Attention 5th grade!
You can practice the Object pronouns with this online activities.

• http://www.englishmaven.org/HP6/Pronouns%20Exercise%201.htm

• http://www.agendaweb.org/exercises/grammar/pronouns/object-3

• http://www.myenglishpages.com/site_php_files/grammar-exercise-object-pronouns.php