Read the signs below. now tell a friend what you must or mustn't do when you are in the library, as in the example. пример: you mustn't talk when you are in the reading room. это те отрывки с которыми надо сделать, 1.smoking is prohibted 2.no food or drinks in the library 3.turn off mobile phines 4.show your card to the librarian when taking out books