完形填空。 Mr Black was once a policeman. He was a kind person. He liked to have a walk in a park after breakfast. It was very cold 1 a winter morning. Mr Black was walking along the street when he heard a 2 for help. He turned around but could 3 nobody. He stopped and looked here and there. At the moment, a boy ran to him. The boy was in such a hurry 4 he couldn't say a word except 5 towards the river in the park. Mr. Black ran to the direction as fast as possible. 6 of them ran along the river and saw a girl in the water. She was 7 a piece of wood. It was carrying her away. It was too 8 . Without a word, Mr Black took off his clothes as quick as he could, jumped into the river and saved the girl onto the bank. (     )1. A. in (     )2. A. cry (     )3. A. look (     )4. A. so (     )5. A. running (     )6. A. All (     )7. A. holding (     )8. A. heavy B. on B. noise B. watch B. and B. pointing B. Both B. lifting B. exciting C. at C. laugh C. see C. that C. driving C. Neither C. taking C. dangerous D. to D. sound D. notice D. then D. looking D. either D. handing D. serious