Click on the links below:

http://www.english-grammar-lessons.com/irregularverbs/exercise4.swf

http://www.adelescorner.org/index.html

Click on the links below

http://www.eslgamesworld.com/members/games/ClassroomGames/Quizshow/Irregular%20Past%20Simple%20Quiz%20Show/

Learn about a famous explorer:
Click on the link below:
http://conteni2.educarex.es/mats/17323/contenido/

Click on the link below:
Past simple.

https://sites.google.com/site/easygrammar4kids/simple-past/simple-past