Zero conditional exercises

https://elt.oup.com/student/solutions1stedition/preint_unit_page/unit6/grammar/exercise2?cc=ec&selLanguage=en
http://www.perfect-english-grammar.com/zero-conditional-exercise-1.html
http://www.learnenglish-online.com/grammar/tests/zeroconditional.html
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/0cond1.htm
http://www.english-grammar-lessons.com/type0/exercise1.swf
http://www.englishexercises.org/makeagame/viewgame.asp?id=9927