Forms 8a, 8c1, 8c2. Passive voice

For practicing:
https://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive1.htm;
https://www.englisch-hilfen.de/en/exercises/active_passive/active_or_passive2.htm;
https://www.englishgrammar.org/active-passive-voice-exercise-8/;
https://www.english-grammar.at/online_exercises/passive-voice/pa010-active-passive.htm;
https://www.english-grammar.at/online_exercises/passive-voice/pa007-active-passive.htm;
https://www.englisch-hilfen.de/en/exercises/active_passive/sentences_gaps.htm;
https://www.ego4u.com/en/cram-up/grammar/passive/exercises?06.
QUIZ:
https://www.proprofs.com/quiz-school/story.php?title=passive-voice.