Since smoking is considered to be very dangerous to the health, it is especially difficult for children to buy cigarettes. One shopkeeper, Mr Smith, has always been 41 about this. If his customers are very 42 , he always asks them whom the cigarettes are 43 . One day a little girl walked into his shop and demanded a packet of 20 cigarettes. She had the exact amount of money in her hand and 44 very sure of herself. Mr Smith was so 45 by her confident(自信的) 46 that he forgot to ask his 47 questions. He asked her what kind of cigarettes she 48 . The girl 49 quickly and handed him the 50 . While he was giving her the cigarettes, Mr Smith said laughingly that she was so young and she should 51 the packet in her pocket in order not to be52 by a policeman. However, the little girl seemed not to find this very53 . Without even smiling she 54 the packet and walked 55 the door. Suddenly she stopped, turned round, and 56 steadily(稳定地) at Mr Smith. There was a moment's deathly 57 and the shopkeeper wondered 58 she was going to say. All at once, in a clear 59 , the girl said, "My dad is a policeman." And 60 those words,she walked quickly out of the shop.