Use the links below to practice Appositives:
http://www.quia.com/pop/8755.html?AP_rand=60817837
http://www.proprofs.com/quiz-school/story.php?title=Appositive
http://depts.dyc.edu/learningcenter/owl/exercises/comma_placement_ex5.htm
Jeopardy Game on Appositives:
http://www.quia.com/cb/8095.html