Dialogue http://www.esl-lab.com/textbooks/textbooksrd1.htm
Listening http://www.esl-lab.com/textbooks/textbookssc1.htm
Vocabulary http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-9626.php
Links for buying and selling exercises http://www.tolearnenglish.com/cgi2/myexam/liaison.php?liaison=_communication_magasin_dialogue_
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