Liu Mei has a h____ family. She lives w____ her grandparents and parents in Dantu. Her father is a doctor. He goes to work o____ foot every day. He is not very tall, b____ he is very strong. Her mother is a teacher. She goes to work by car. She often h____ her students at school. Liu Mei's grandparents stay at home. In the morning, they go t____ the park. In the afternoon, they d____ tea with their friends. In the e____, they watch TV .Liu Mei is a student in No.1Middle School. Her school is beautiful. There are many tall b____ there. She wants to s____ everyone around her school. She likes it very much.

(1)指出下列物质里，哪些是混合物____ 哪些是纯净物____ （填序号）。
①净化后的空气 ②二氧化碳 ③稀有气体 ④蒸馏水
(2)酒精：①无色透明；②易燃烧；③常作酒精灯和内燃机的燃料；④当点燃酒精灯时，酒精在灯芯上汽化；⑤燃烧生成水和二氧化碳。根据上述文字可归纳出酒精的物理性质有____ （填序号，下同），化学性质有____ ，用途有____ ，酒精发生的物理变化是____ ，发生的化学变化是____。