https://elt.oup.com/student/solutions1stedition/preint_unit_page/unit6/grammar/exercise2?cc=pl&selLanguage=pl
http://www.learnenglish-online.com/grammar/tests/zeroconditional.html
http://www.english-grammar-lessons.com/type0/exercise1.swf
http://www.englishgrammarsecrets.com/type0/exercise4.swf
http://www.english-grammar-lessons.com/type0/exercise2.swf
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