善意常在：19岁志愿者的温柔救援（补全句子）
Alexander is a 19-year-old volunteer. He brings food to old people every week.
One day, he went to see an old woman named Lana. Lana was very weak. She fell on the floor and could not move. She saw Alexander through the camera on the door. She shouted for help.
Alexander called the hospital at once. He talked with Lana to make her relaxed. Soon the doctors came and helped her.
Alexander loves volunteering. He thinks it is great to help people in need.
根据短文内容补全句子，每空限填一词