材料一：

材料二：艺术家同时也是一个政治人物，他会经常关心悲欢离合的实情，并从各方面做出反应。他怎么能不关心别人，怎么能以一种逃避现实的冷漠态度而使自己同你的那么丰富的生活隔离起来呢？不，绘画并不是为了装饰住宅而创作的，它是抵抗和打击敌人的一个武器。

请回答：

____ We had a lot of fun _______ (sing) in the classroom.
____ She decided ________ (buy) the red dress.
____ This sound made the baby ________ (cry).
____ Most boys enjoy _______ (play) football after school.
____ The shop is always ______ (crowd) on weekends.
____  Would you like _____ (go) shopping with me?
____ I saw a little girl ______ (look) for her parents on the street when I walked across it.
____ ______ (be) you at the shop last Friday?
____ The boy spends a lot of time ________ (practice) the piano in the room.
____ Look! Who _______ (stand) near the door?

①体系中发生反应的化学方程式是____

②该反应在0～5min时间内产物Z的平均反应速率：____

③该反应达到平衡时反应物X的转化率α等于____．