（Ⅰ）  求函数f（x）的解析式；

（Ⅱ）  若f（ $\frac{\alpha }{2}$ ）= $\frac{4}{5}$ ，求sin（ $\frac{5\pi }{6}$ ﹣α）的值．

根据句意及首字母提示完成单词
E____  in our class likes English.
I can't stand this t____ weather.
I don't like lions because they're u____  .
I don't like his new l____ .
Wang Lin is the c____ of the basketball team.
Look! There are a g____  of children on the beach.
The students are taking photos with a c____ .
Her mother is tall and a little bit h____ .
My sister is a n____  in the hospital.
We have many great s____ in the restaurant. 

park    hear  ____