PASSIVE VOICE PRACTICE

 http://a4esl.org/q/h/vm/active-passive.html                                          

 http://www.eslgo.com/quizzes/raiderspassive.html                             

http://www.englishclub.com/grammar/verbs-voice_quiz.htm     

 http://www.better-english.com/grammar/passive1.htm                    

http://www.autoenglish.org/gr.pas.i.htm