F7 Relatives/Modals

https://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns.htm
https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?02
http://www.eflnet.com/grammar/relpronoun.php

https://agendaweb.org/exercises/verbs/modals/mixed-test-1
https://www.english-grammar.at/online_exercises/modal-verbs/m009.htm
http://www.focus.olsztyn.pl/en-modal-verbs-practice.html