It's a rainy day. A woman gets on a bus with a dog. It is a big dog. Its feet are very dirty. The woman says , "Oh , conductor(售货员), if I buy a ticket for my dog, can he have a seat like the other people? The conductor looks at the woman and then he says,"Certainly,Madam. He can have a seat like all the other people on the bus, but he must not put his feet on the seat like the other people on the bus."