I found this very interesting for you to practice. It's a grammar box of verb to be in past: was/were, There are also some exercises below.

Exercises:
http://www.englisch-hilfen.de/en/exercises/tenses/was_were.htm
http://www.englishmaven.org/HP6/To_Be_Exercise6.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=562
http://suz.digitaleschulebayern.de/english/grammar/was_were1.htm
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