Here you can revise the grammar before doing some practice:
http://www.edufind.com/english/grammar/past_continuous.php
http://learnenglish.britishcouncil.org/ar/english-grammar/verbs/past-tense/past-continuous
http://www.ego4u.com/en/cram-up/tests/past-progressive-1
http://www.eflnet.com/grammar/pastprog.php
http://www.englishgrammarsecrets.com/pastcontinuous/exercise4.swf
http://www.englishgrammarsecrets.com/pastcontinuous/exercise1hp.swf
http://www.eflnet.com/grammar/whquestionspastprog.p
http://www.eflnet.com/grammar/whquestionspastprog.php
http://www.english-grammar-lessons.com/pastsimpleorcontinuous/exercise3.swf
http://www.english-grammar-lessons.com/pastcontinuous/exercise4.swf
http://baladre.info/english/sedaviwebfront/pastsimpcont4.htm
http://ingles.iesboliches.org/activities/grammar/tenses/SIMPLE_PAST_OR_PAST_C
http://www.english-grammar-lessons.com/pastcontinuous/exercise1.swf
http://www.english-4u.de/past_prog_ex6.htm
http://www.learnenglish.de/Games/Tenses/PastSvsPastC.htm
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