http://www.imparareinglese.co.uk/esercizi_inglese/zero_first_conditionals.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-45745.php
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/1cond2.htm
ZERO
http://www.english-grammar-lessons.com/type0/exercise2.swf
http://www.english-grammar-lessons.com/type0/exercise3.swf
http://www.esl-lounge.com/student/grammar/2g42-what-do-you-do-if.php
http://www.1-language.com/englishcoursenew/unit40_grammar_exs.htm
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