https://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exercises?02
http://www.englishexercises.org/makeagame/viewgame.asp?id=3227
http://www.learnenglishfeelgood.com/grammar-secondconditional2.html
http://www.english-grammar-lessons.com/secondconditional/exercise1.swf
http://www.focus.olsztyn.pl/en-second-conditionals-exercises.html#.WIez-NLhC1s
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