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    Key Redemption

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    To access purchased content or to download files from the Companion Website, you will need to create an account and register your product.
    Sign in to an existing account or register a new Cheng & Tsui account and enter your product key exactly as it appears.

    (Note: Some products will require you to answer a validation question instead of entering a product key.)

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Answer key policy

Answer keys are available free of charge for a limited number of Cheng & Tsui publications. Because of the sensitive nature of such material, we are only able to offer answer keys to teachers formally affiliated with a school or institution. We are unfortunately unable to offer answer keys to independent learners.

To obtain an answer key for a product published by Cheng & Tsui, please contact us with your name, the school/institution you are associated with, and the name of your course. To expedite the approval process, please also include a link to your school's staff directory, or similar web page that confirms your employment as a teacher.