Here you can pracise a lot:
http://www.agendaweb.org/verbs/modals-exercises.html
http://www.xtec.cat/~ogodoy/sac/rephrasing/rephrexercises.htm
http://www.englishpage.com/modals/interactivemodal1.htm
http://www.perfect-english-grammar.com/modal-verbs-exercises.html
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