Articles - the definite article

http://www.learn4good.com/languages/evrd_grammar/article_ex.htm

http://www.usingenglish.com/quizzes/218.html

http://www.englisch-hilfen.de/en/exercises/nouns_articles/article_the3.htm

http://www.englisch-hilfen.de/en/exercises/nouns_articles/article_the2.htm

http://www.englishlearner.com/tests/the_definite_article_1.shtml

http://www.usingenglish.com/quizzes/50.html

http://www.usingenglish.com/quizzes/216.html