zero and first conditional exercises

http://www.learnenglish-online.com/grammar/tests/zeroconditional.html
http://www.perfect-english-grammar.com/first-conditional-exercise-1.html
http://www.esl-lounge.com/student/grammar/2g62-first-zero-conditional-missing-extra-words.php
http://speakspeak.com/english-grammar-exercises/upper-intermediate/zero-first-second-third-conditionals