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Objective Key Workbook With Answers Vietnam Edition 2 Objective Key Second edition is an update and revised and revised edition of Objective KET. It is oficial preparation for Cambridge English: Key, also known as Key English Test (KET). Short units for tangible progress offfer a variety of variety of lively topics for younger students wwhile providing thorough training in exam skills and solid language development. The Workbook with answers provides ample opportunity for further practice of new language and skills either at home or in the classroom.