Possessives

These are the links for you to practice
http://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s.htm
http://www.englisch-hilfen.de/en/exercises/nouns_articles/apostrophe_s2.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-58021.php
http://suz.digitaleschulebayern.de/english/grammar/saxong3.htm