Test your irregular verbs
http://www.englishpage.com/irregularverbs/interactiveirregularverbs1.htm
http://www.ego4u.com/en/cram-up/tests/simple-past-1
http://www.cityu.edu.hk/elc/quiz/irrequiz.htm
http://www.angelfire.com/on/topfen/testspastsimp1.html
http://grammar.ccc.commnet.edu/grammar/cgi-shl/par2_quiz.pl/irregular_quiz.htm