完形填空。 Yesterday when my son and I were eating dinner, I saw a policewoman walking past our house. A woman with a 1 look was following her. I opened the 2 , went out and asked if everything was OK. The policewoman said that the woman's 3 had gone missing (失踪) an hour earlier. I said that we hadn't seen the girl, but we could 4 . I explained to my son that we couldn't finish our 5 right then. He said, 'Be a kind person, Dad.' We got in our car and 6 the girl all over the town. Along the way, a group of children were playing. 7 they heard what had happened, they said they would help 8 . They rode their bikes and joined us. 9 the little girl was found safe a few miles away. I was so 10 to see many people help a stranger. It is a nice world. (     )1. A. worried (     )2. A. mouth (     )3. A. son (     )4. A. succeed (     )5. A. housework (     )6. A. looked for (     )7. A. Before (     )8. A. them (     )9. A. Luckily (     )10. A. proud B. laughing B. car B. daughter B. eat B. dinner B. looked at B. After B. you B. Possibly B. strange C. surprised C. door C. mother C. help C. games C. looked after C. Although C. us C. Sadly C. happy