First conditional:
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-1/exercises
http://www.learnenglish-online.com/grammar/tests/1stconditional.html
http://www.englishgrammarsecrets.com/firstconditional/exercise3.html
Second conditional:
http://www.learnenglish-online.com/grammar/tests/2ndconditional.html
http://www.englishgrammarsecrets.com/secondconditional/exercise2.html
http://www.englishgrammarsecrets.com/secondconditional/exercise5.html
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