Simple Present exercises

http://www.esl-lounge.com/student/grammar/1g67-elementary-present-simple-multiple-choice.php
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pres1.htm
https://www.learnclick.com/mchoice/show/821
http://www.elt-els.com/2013/08/multiple-choice-test-simple-present.html