Present simple or Continuous?

Choose. Present Simple or Present Continuous?
http://www.autoenglish.org/gr.prescon.i.htm
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.learn-english-online.org/Lesson14/TestIt/PSvsPC.htm
http://eolf.univ-fcomte.fr/uploads/ressources/grammar/17_verb_tenses/01_sp_or_pc/01.htm