http://www.englishexercises.org/makeagame/viewgame.asp?id=4617
http://www.englishexercises.org/makeagame/viewgame.asp?id=4102
http://www.1-language.com/englishcourse/unit12_grammar_exs2.htm
http://www.agendaweb.org/exercises/grammar/demonstratives/this-that-these-those
http://oud.digischool.nl/en/grammatica/aanwijzend-vraag.htm
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