阅读下面短文，从短文后所给各题的四个选项中选出能填入空白处的最佳选项．

　　A doctor was once teaching a class of medical students at a famous hospital. An injured（受伤的）man was ___1___ and the doctor turned to one of the ___2___ and asked him：

　　“What's wrong with this man?”

　　“I don't know, sir,” the student answered.“___3___ I examine him and find out?”

　　“There's no ___4___ to examine him,” said the doctor. “You should ___5___ without asking questions. He has ___6___ his right leg.” “Didn't you ___7___ the way he walked? He hurt it by ____8___ it in the fire. You see his right leg is ___9___ away until the knee. This is Monday morning. Yesterday was ___10__, but on Saturday the roads were ___11___. The man's trousers are covered with dirt ___12___. The man fell down on ___13__ night.” The doctor then ___14___ the man and said, “You had your wages（工资）on Saturday and went to a public house and ___15___ too much. You got wet and ___16___ on the way home. You tried to dry your clothes ___17___ when you got home. ___18__ you had drunk too much, you ___19___ the fire and burnt your knee. Is that ___20___?”

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　　One morning, Mrs Smith was driving home after She had done some shopping. When she passed a rubbish dump, she noticed 1 like a microwave oven not far from the side of the road.

　　“John is a good 2 ,” she said to herself. “Perhaps he can 3 this. I'll take it home and let him try.”

　　She picked up the oven and put it in the 4 of her car. Then she drove on 5 . A few kilometers later, she heard the siren of 6 behind her. She looked in the driving mirror and saw a policeman 7 to her to pull over and stop.

　　Mrs Smith was very 8 . She slowed down at the side of the road. A 9 policeman got out of the police car and walked up to her.

　　“Can I see your 10 license, please?” he demanded politely. He copied 11 details of her name, address and the number of her car. “ 12 , officer?” Mrs Smith asked.

　　The policeman did not reply. He looked 13 the car and then at the back.

　　“Open the boot, please.” he said to Mrs Smith.

　　Mrs Smith was even more puzzled. She opened the boot 14 pointed to the “microwave oven”. “I 15 this old microwave oven a few minutes ago.” she said, “I am just taking it home to see if my 16 can repair it.”

　　The policeman stared at her for a moment to see if she was 17 the truth.

　　“That's not a microwave oven,” he said at last. “That's our radar set. It was the start of a speed trap. Do you mind if we have it 18 ?”

　　Mrs Smith's face turned 19 . “Oh,” she said, “I'm very sorry. I wouldn't have 20 itif I'd know what it was.”

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　　One afternoon just before Christmas, an old gentleman was wandering through the city center. The shops were packed ___1___ good things and ___2___ with cheerful shoppers. The children were gazing in wonder at all the toys on show in the ___3___. Suddenly in the middle of the crowd he saw a dirty little boy sitting on the pavement ___4____ bitterly. When the kind old man asked him why he was crying, the little boy told him that he had ___5___ a ten penny piece that his uncle had given him. Thrusting his hand into his ___6___ the old man pulled out a handful of coins. He ___7__ a shiny, new ten penny ___8___ and handed it to the boy. “___9___” said the little boy , drying his ___10___, he cheered ___11___ at once.

　　An hour ___12___ later the old man was ___13___ his way back the same route. To his ___14___ he saw the same dirty little boy in the same spot, crying just as bitterly as before. He went up __15___ the boy and asked him if he had lost ten pence he had given him. The little boy told him that ___16___ he had not lost the ___17__ coin, but he still could not find his first ten pence. “If I ___18____ find my own ten pence,”he said___19__,“I'd have___20___ pence now.”