Easy exercise: http://www.englisch-hilfen.de/en/exercises/active_passive/passive_sentences1.htm
Multiple-choice exercise: http://www.better-english.com/grammar/passive1.htm
Complete the sentences: http://www.better-english.com/grammar/thepassive3.htm
Transform: http://esl.about.com/library/quiz/blgrquiz_passive2.htm
Passive voice exercies. Fill in the gaps: http://pagesperso-orange.fr/raud.dugal/advenced/passive%20voice/passivevoice.htm
Advanced level: http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/passive2.htm
More: http://englishonline.free.fr/GrammarAndHelp/Passive/TurnIntoPassive.htm
Grammar: http://www.englisch-hilfen.de/en/grammar/passive.htm
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