Practice of the "th" sound

To practice the "th" sound, please enter to the following link and watch the video:

http://www.youtube.com/watch?v=Ag4qoNzEH4w


Then, enter to this link and answer the exercises:

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-66477.php

Check this link:

http://www.docstoc.com/docs/13206814/Tongue-Twisters---TH