There are a few exceptions, such as fair use, but this is a narrow exception that typically applies to limited quotations, criticism, commentary, or parody. Simply reposting a significant portion of a web activity page for educational purposes usually doesn't meet the criteria for fair use.
To use the material legally, the teacher needs to:
* Obtain permission from the copyright holder: This is the most straightforward and reliable method. They should contact the website owner or the creator of the content to request permission to reproduce it.
* Use materials that are in the public domain: These are works whose copyrights have expired or were never claimed.
* Use materials licensed under Creative Commons or similar open licenses: These licenses grant specific permissions for the use and sharing of content, often with attribution requirements. The license terms must be carefully followed.
Failing to obtain permission or to utilize materials in the public domain or under appropriate licenses constitutes copyright infringement, which can lead to legal consequences for the teacher and their institution.