Read and study seriously and be concerned about world affairs. 2. Keep quiet and pay attention to cleanness. 3. Do not talk or laugh loudly; do not smoke or eat, do not litter the floor with waste paper. 4. Spit only in the places designated. 5. Show your student card or identity card when borrowing hooks. Borrow only one book at a time. 6. Protect public property. Do not scribble on the pages of books or tear them out. Pay the cost price for any damage done. 7. Do not move the desks or chairs about. Close the windows when leaving. 8. Let the readers and librarians help each other and jointly run the reading room well. How many books can you borrow by using your student card ______at a time.