http://www.proprofs.com/quiz-school/story.php?title=first-conditional
http://www.elt-els.com/2014/04/conditional-sentences-first-conditional_23.html
http://www.english-grammar-lessons.com/firstconditional/exercise1.swf
http://www.1-language.com/englishcoursenew/unit41_grammar_exs.htm
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