Brian is my good friend. He has a five-year-old daughter, Lydia. Lydia likes animals very much and always   1  to have a dog. This Sunday is Lydia's birthday. Brian wants to buy  2  a dog. So he goes to the   3  near his home. He says hello to Paul, the owner（主人）of the store. Paul says hello to him, too. Brian says, "This is a clean and   4   pet store." Then he walks around the store.   5  he doesn't see any pets. "Excuse me.   6  are the pets?" he asks. "The pets are right here," says Paul. Then Paul   7  him a catalog（目录簿）. Brian sees   8  pictures of pets in it, like dogs, cats and birds. "You only need to   9  me the pet you like," says Paul. "We can mail（邮寄）it to you." "What if I don't like it?" asks Brian. "  10  mail it back," says Paul. "Oh, sounds interesting," says Brian.