http://www.esoeonline.org/main-index/index-exercises/grammarexs/elem/elemconjunctions.htm
http://eolf.univ-fcomte.fr/uploads/ressources/grammar/08_links/01_purple-blue/01.htm
www.esltower.com/GRAMMARQUIZ/intermediate/conjunctions so, until,because, when.htm
http://a4esl.org/q/h/lb/sobe.html
www.eflworksheets.com/onlineexercises/beginners/grammar/linkers1.htm
www.english-4u.de/conjunctions.htm
eolf.univ-fcomte.fr/uploads/ressources/grammar/08_links/03_and_but_so_etc_02/02.htm
http://iteslj.org/v/s/ab-conjunctions.html
http://www.1-language.com/englishcourse/unit20_grammar_exs.htm
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