短文填空    One day I found a little girl sitting in the park sadly. Lots of people passed by but never s____ to see why she looked so sad. As I got closer I saw that her back had a strange shape. That's a hump (驼背)! Perhaps that was the r____ why people just passed by and make no effort to help. I sat down beside her and said, "Hello!" Then she, in a low voice, said, "Hi." I smiled and she smiled shyly. Then we talked  there u____ it got dark. I asked the girl why she was so sad. She looked at me and said with a sad face, "Because of the hump."
    "But, you make me thought of an angel (天使), sweet and friendly," I said. She looked at me and asked, "Really?" I said, "Yes, I think you are an angel and you come here to watch over all those people walking by." When she h____ this, the little girl jumped up. "I am! I'm an angel!" I was happy because she was not s____ anymore.