http://www.englisch-hilfen.de/en/exercises/active_passive/questions.htm
http://www.englisch-hilfen.de/en/complex_tests/passive1/index.php
http://www.agendaweb.org/exercises/verbs/passive-1
http://www.agendaweb.org/exercises/verbs/passive-write-1
http://learningapps.org/12735
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