请根据所听到的短文内容和表格中的提示词语,将所缺的关键信息填写在下面的表格中。 Where're the visitors? 1. They're in the Guide Dogs _______. What is the guide dog used for? 2. It helps people who can not _______. Who taught a dog to guide a person first? 3. In 1918, a _______ taught his dog. What are the best dogs for the job? 4. They are _______. What does the speaker mainly tell us about? 5. _______.