His, hers, mine, ours, yours, and theirs

#1 - Try this activity using his, her, their, our, mine, and your

http://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?03

#2 -Try this activity using his, hers, theirs, ours, mine, and yours

http://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?04

#3 -This is another activity for practice:

http://www.englishexercises.org/makeagame/viewgame.asp?id=5173

#4 -Try a 20 Question Quiz:

http://www.grammar.cl/Games/Possessive_Pronouns.htm