Quizzes, Book Reviews, and Practice Questions all have the ability for students to hear the prompts and feedback read aloud and to speak their answers rather than type them out. This allows students who find it challenging to read, type, or spell to still be fully engaged in the program.
To edit the voice options for your students, click on the drop-down in the upper right of your teacher account, then Settings. On that window, click Voice Options on the bottom left: