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    Product Registration Help

    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.