Interchange Level 1
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Touchstone Level 4
Touchstone, together with Viewpoint, is a six-level English program based on research from the Cambridge English Corpus.Authors: Jack C. Richards, with Jonathan Hull, with Susan Proctor, Michael McCarthy, Jeanne McCarten, Helen SandifordEnglish Type: American EnglishCEF Level: B1 - B2Publication date: January 2014
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