explanation http://www.tinyteflteacher.co.uk/learning-english/grammar/defining-relative-clause.html
https://elt.oup.com/student/solutions/int/grammar/grammar_03_012e?cc=global&selLanguage=en
http://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?09
http://bogglesworldesl.com/RelativeClauseCrosswords.htm , try the first crossword in this link
Enjoy!
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