The so-called famous sentences, as the name implies, are words spoken by celebrities. I don't know what book you are talking about. If it is a textbook, it should be to write the ancient poems in the article twice. If you are afraid that you are not sure, you can pick some famous sayings. Generally, these words are obvious in the article, such as quotation marks. The teacher won't be so bored that you can look for them at random. Pick the obvious and representative ones. I hope it helps you.