Practice 1
Please visit the following links and quizzes:
Quiz 1:
http://www.wuc.edu.au/call/mdthree/modalthree.htm
Quiz 2
http://www.nonstopenglish.com/exercise.asp?exid=917
Quiz 3
http://www.english-test.net/esl/learn/english/grammar/ei007/esl-test.php
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