1.Keep quiet，please!

请保持安静！

2.you should return the book on time.

你应该按时把借的图书还给图书馆。

3.You should put the book back on the right shelf when you finish it.

当你看完的时候，你应该放回正确的书架上。

4.Take care of the book.

要爱护书籍。

5.Don't draw or write anything on the page.

不要在书上乱涂乱画。