Past Simple - exercies

http://www.english-4u.de/iv_quiz9.htm
http://www.englishpage.com/irregularverbs/interactiveirregularverbs1.htm
http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03
http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?04
http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?02
http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?05
http://www.english-4u.de/past_tense_ex3.htm
http://www.english-4u.de/past_tense_ex4.htm

Irregular verbs - quiz

http://www.quia.com/cb/8111.html