为了得到6V电压，应用____ 节干电池串联起来；人造卫星展开太阳电池板，把太阳能转化为电能提供给卫星上的用电器使用，使用太阳能电池的好处有____ （写出一种即可）。

    I have a friend. His name is Li Daming. He often gets up ____ six o'clock in the morning. He ____ breakfast at seven. He goes to school five days a week. After school，he ____ plays games for half an hour. Look! What is he doing？He is ____ basketball. In the evening he does his ____ and he likes listening to music. He often ____TV for half an hour____ he finishes his homework. He goes to bed at ten o'clock. Do you ____ him?

一个数十位上是6，个位上是8，这个数是____．

72是____位数，7在____位上．

历时2个多月的第31届中国哈尔滨国际冰雪节在哈尔滨冰雪大世界开幕，哈尔滨多年平均雪期约为（　　）