Improve your English

Avoid mistakes!

Thinking X Sinking http://www.youtube.com/watch?v=kx21qAAdhuY
100 most used words http://www.youtube.com/watch?v=0Hz9Xgyx0A0&feature=related
Improve your English http://www.youtube.com/watch?v=os3pCCpdlWE&NR=1