USED TO EXERCISES

http://www.perfect-english-grammar.com/used-to-exercise-1.html

http://www.montsemorales.com/gramatica/Usedto.htm

https://elt.oup.com/student/solutions1stedition/int_unit_page/unit2/grammar/exercise2?mode=hub&cc=co&selLanguage=en

http://www.time4english.com/aamain/school/e1al1.asp

http://www.usingenglish.com/quizzes/115.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=3728