It is rude to make too much noise.
Arnie was talking to his friends outside the libary.
Arnie wants to get to studying.
Arnie and his friends stop talking once they enter the library.
Arnie enters the libary with his friends and keeps talking about what to study.
Arnie and his friends quickly start looking for the books they need.
Arnie and his friends are quickly told to be quiet because it's a libary.