Here you have some exercises.
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex10
http://www.englishpage.com/verbpage/verbs1.htm
http://www.usingenglish.com/quizzes/66.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-13689.php
http://www.e-grammar.org/present-simple-continuous/test1-exercise1/
http://www.e-grammar.org/present-simple-continuous/test1-exercise3/
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