Exercises to practice future:
http://esl.about.com/library/quiz/blgrquiz_futureforms.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=4180
http://www.englisch-hilfen.de/en/exercises/tenses/future.htm
http://www.englisch-hilfen.de/en/exercises/tenses/future2.htm
http://www.englisch-hilfen.de/en/exercises/tenses/will_going_to_future.htm
http://www.ego4u.com/en/cram-up/grammar/future-mix/exercises
http://www.englishpage.com/verbpage/verbs24.htm
http://english.lingolia.com/en/grammar/tenses-comparison/future-tenses/exercises
http://www.learnenglishfeelgood.com/mixed-future-tenses2.html