Ответ:
run (−)
You mustn't run in the library.
eat and drink (−)
You mustn't eat and dring in the library.
ask the librarian questions (+)
You can ask the librarian questions in the library.
drop litter (−)
You mustn't drop litter in the library.
listen to loud music (−)
Yoy mustn't listen to loud music in the library.
speak quietly (+)
You can speak quietly in the library.
bring pets inside (−)
You mustn't bring pets inside the library.
talk on the mobile phone (−)
You mustn't talk on the mobile phone in the library.
use a computer (+)
You can use a computer in the library.
send text messages (+)
You can send text messages in the library.