which of the following things should/shouldn't students do in the school library? why?

discuss a maths project
print our marerials for a school conderence
have lunch
use a computer to search fot some information before the lesson
have a meeting of the student council
help a classmate to do their homework
play chess during the break
sit comfortably on the floor
take a photo of the necessary page
listen to your favourite music
put the book on the wrong shelf