Form 7b. Past Simple. Used to

For practicing:
https://www.english-4u.de/en/grammar/past-simple.htm;
https://www.perfect-english-grammar.com/past-simple-exercise-8.html;
http://www.esl-lounge.com/student/grammar/3g80-intermediate-past-simple-or-used-to-gap-fill-exercise.php;
https://www.perfect-english-grammar.com/used-to-exercise-2.html.
QUIZ:
https://www.englishclub.com/grammar/verb-tenses_past_quiz.htm;
https://www.proprofs.com/quiz-school/story.php?title=used-to-past-simple.