English class.

THIS, THAT, THESE and THOSE

1. http://www.agendaweb.org/exercises/grammar/demonstratives/this-that
2. http://www.englishexercises.org/makeagame/viewgame.asp?id=4617
3. http://www.ecenglish.com/learnenglish/lessons/what-are-demonstrative-adjectives             
4. http://www.learnenglish-online.com/grammar/tests/demonstrativespronouns.html