https://elt.oup.com/student/solutions1stedition/ui_unit_page/unit3/grammar/exercise2?cc=us&selLanguage=en
http://www.englishexercises.org/makeagame/viewgame.asp?id=6672
http://www.englishpage.com/verbpage/verbs26.htm
http://englishteststore.net/index.php?option=com_content&view=article&id=10475:English-Future-Perfect-vs-Future-Continuous---Test-07&catid=271:basic-grammar-future-perfect-vs-future-continuou&Itemid=391
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