Smoking is considered dangerous to the health. Our tobacco-seller Mr. Johnson, therefore, always asking his customers if they are very young, whom the cigarettes are bought 1 . One day, a little girl whom he had never seen before walked boldly 2 his shop and demanded twenty cigarettes. She had the large 3 of money in her hand and seemed very 4 herself. Mr. Johnson was so 5 by her confident manner that he 6 to ask his usual question. 7 , he asked her what kind of cigarettes she wanted. The girl 8 readily and handed him the money. While he was giving her the 9 , Mr. Johnson said laughingly that as she was so 10 she should 11 the packet(小盒) in her pocket in 12 a policeman saw it. However, the little girl did not seem to 13 this very funny. Without 14 she took the 15 and walked towards the door. Suddenly she stopped, turned 16 and looked steadily at Mr. Johnson. 17 was a moment of silence and the tobacco-seller wondered 18 she was going to say. And at once, in a clear, joking 19 , the girl declared, “ 20 dad is a policeman,” and with that she walked quickly out of the shop.