PASSIVE VOICE EXERCISES

http://a4esl.org/q/h/vm/active-passive.html
http://www.englisch-hilfen.de/en/complex_tests/passive2/index.php
http://www.englisch-hilfen.de/en/complex_tests/passive1/index.php
http://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive.htm
http://www.englisch-hilfen.de/en/exercises/active_passive/word_order.htm
http://www.englishgrammar.org/active-passive-voice-exercise-8/
https://www.englishclub.com/grammar/verbs-voice-quiz.htm