More activities on the passive voice can be done on these links:
https://agendaweb.org/verbs/passive-voice-exercises.html (Intermediate level)
https://agendaweb.org/verbs/passive-present-past-exercises.html (Upper intermediate level)
http://www.english-4u.de/passive_ex1.htm
https://www.ego4u.com/en/cram-up/grammar/passive