Article or no article?

Practise the use of the articles in these links:





Now practise in these other links:
http://www.englishexercises.org/makeagame/viewgame.asp?id=71#a


http://www.grammar-quizzes.com/art-4.html

http://esl.about.com/library/quiz/bl_articles1.htm

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