https://quizlet.com/37455913/flashcards (Learn and Test)
http://www.eltbase.com/quiz/241_02.htm
https://englishelxna1.wordpress.com/2012/04/19/permission-obligation-necessity/
https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?12
https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?04
http://www.englishexercises.org/makeagame/viewgame.asp?id=4219
http://www.dcielts.com/ielts-vocabulary/employment-vocabulary-and-exercises/
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