It is Saturday morning. Mr. and Mrs. Green are at home 1 their two children.2 is their son, Jim. 3 is their daughter, Kate. They 4 have classes today. They are 5 chess in their room. They are 6 happy. Mr. Green is 7 a book in the living room.  8 is Mrs. Green? 9 is in the kitchen(厨房).She is cooking(烹调） lunch 10 the family.

    What a happy family!

如图是钢琴键盘的一部分，若从4开始，依次弹出4，5，6，7，1，4，5，6，7，1，…，按照上述规律弹到第2016个音符是____ ．

②氧化铝和氢氧化钠溶液反应的离子反应方程式____．

③OH^﹣+H⁺═H₂O改写为化学方程式____．