A:what are the library rulas,Bruce?
B:Oh,( don't )( talk )to each other loudly in the library.Or other people will be angry.
A:can I( listen )(to )muisc in it?
B:No,and we can not eat ( or )drink there.we must keep it ( clean ).
A:can I take any books ( out )of the libreary?
B:no,we must read them in the library.
A:what( else
B:On rainy days,we have to (leave )our umbrellas ( outside )the library.
A:Oh,I see .thank you.