http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises
http://www.e-grammar.org/past-simple-continuous/test1-exercise1/
http://www.e-grammar.org/past-simple-continuous/test2-exercise1/
http://www.e-grammar.org/past-simple-continuous/test3-exercise2/
http://www.englishtenses.com/exercise/past_continuous_and_simple
http://englishlearner.com/tests/past_simple_-_past_continuous_quiz_1.shtml
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex02
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex04
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex05
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex06
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex08