看图，完成下列对话，每空一词。

A：There are some __________ ___________．
What __________ they mean?
B：This sign means“__________ __________”．
It __________we__________ make noise here．
A：OK．I like birds．Let’s watch them quietly．
B：Look at this public sign．
A：What __________ it mean?
B：It means“__________ __________ or __________ ”．
A：So we can’t give the birds drinks or food．