Whose apartment is (bigger, cheaper, closer, nicer, better...)
Comparing with Adjectives: When we compare 2 things, we use -er or "more" if the word is longer. There are a few more rules that we will learn.
Practice: http://www.englishexercises.org/makeagame/viewgame.asp?id=2070
We learned about possessive pronouns. Here is some practice:
Possessive pronoun practice: http://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?04
http://www.englishexercises.org/makeagame/viewgame.asp?id=5173
http://www.myenglishpages.com/site_php_files/grammar-exercise-possessive-pronouns.php#.VFGHH_nF9VY
http://www.learnenglishfeelgood.com/esl-possessive-pronouns2.html