Interchange Level 3B
Online Self-Study and Online Workbook (Institutional Version)
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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: B1Publication date: June 2014
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