There are some notes written in various places. !!! The following is an important note, so please read it carefully. This product also includes digital materials that you download to your PC by entering a digital access code, but this digital access code can only be used twice. I used the code once to download the materials to my PC. After that, I lent this book to an acquaintance, so the download limit may have been reached. If you can't download the materials, you won't be able to get the audio for listening, speaking, and writing. You can definitely practice reading with the book, as it doesn't require audio. Please understand that this is a junk item, as it is uncertain whether the digital materials can be used. #TOEFL #ETS #EnglishLearning