PAST SIMPLE EXERCISES

http://www.adelescorner.org/grammar/past_tense/past_simple_quests2.html
http://www.englisch-hilfen.de/en/exercises/questions/simple_past2.htm
http://www.englisch-hilfen.de/en/exercises/questions/simple_past.htm
http://www.perfect-english-grammar.com/past-simple-exercise-6.html
http://www.agendaweb.org/verbs/past-simple-questions.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-8184.php

Past Simple Vs. Present Simple

http://www.englishexercises.org/makeagame/viewgame.asp?id=5484
http://www.englishpage.com/verbpage/verbs12.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-43852.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-51619.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-87374.php
http://www.saberingles.com.ar/curso/lesson15/06.html