The library is very quiet, only hear the slight footsteps, only hear the rustling of people turning pages. This is a sentence describing the quiet atmosphere of the library, which shows the silence of the library by emphasizing "only hearing" In this sentence, you can fill in the sounds related to the library, which can reflect the quiet atmosphere, such as footsteps, the sound of turning over books, the sound of the pen gently crossing the books and so on.