Ответ:
You mustn't run in the library
You mustn't eat and drink in the library
You must ask the librarian question in the library
You mustn't drop letter in the library
You mustn't listen the music in the library
You must speak quietly in the library
You mustn't bring pets inside in the library
You mustn't talk on the mobile phone in the library
You must use a computer in the library
You must send text messages in the library