1. (2022七下·光明月考) 读下面短文，从短文后所给的A、B、C、D 四个选项中选出能填入相应空臼处的最佳选项。

It was a sunny day and I walked back home after school. When I stood in front of the door, I was shocked to find that the key wasn't in my pocket. It was1, because I only had one key and my parents were not at home. I walked around the community (社区) and searched for it2, hoping to find the lost key. But I couldn't find it. I called my mum and she told me to go to my aunt's home. My aunt lives in another3of our community. I was sad, but I had no choice. The next morning, when I was going to school, I saw something shining on the window of the4. It was my key. "Unbelievable!" I was quite5as I held the key in my hands. "Is that yours, kid？" the old guard（保安）asked. "Yeah. I6it yesterday. Who sent this？"I said. The old man said, "I don't know. Someone7last night. "To pick up a key from the ground and take it to the security hut（保安亭） was not something8-but it meant so much to me. I cannot express my thanks to the person who found my9. But I can pass on his or her kindness by10his or her steps to help others.