（Ⅰ）求椭圆 $C$ 的方程；

（Ⅱ）若 $\left|PM\right|\cdot \left|PN\right|=\frac{3}{7}\left|MN\right|$ ，求直线 $l$ 的方程．

小王利用计算机设计了一个程序，输入和输出的数据如下表：

那么，当输入数据8时，输出的数据是（　　）

******在参观《复兴之路》展览时指出：“实现中华民族伟大复兴，就是中华民族近代以来最伟大的梦想。”以下表格梳理了近代以来先进的中国人为实现民族复兴梦进行的四次重大探索，请按提示补充完成表格，并回答相关问题。

    I became lame（瘸的）in both legs in my childhood. I can't stand1 the support of two sticks. Only in my wheelchair can I “2”.

    I still remembered the first day at 3 .When I appeared at the door,4 in the classroom stared（凝视）at me in 5 .My face turned6 .I couldn't help7back.It was the8and sympathy（同情）in their eyes that9me doing so.I went shyly towards an unoccupied（空的）seat.

    Being lame,I didn't dare（敢）to10in front of my classmates.I was afraid that I might be  11at.In those days I was very sad to see others walking12.

    One day, a few students came up to me and asked me to go outside.I was really13They encouraged me with a(n)14 smile and15 me in my wheelchair from place to place.I was16 to them for giving me a chance to see the 17of our lovely school with my own eyes.

    After that we often read,played and talked together.My friends are always18to help me.It made me19I am handicapped（残疾的）.

    Once they asked me, “What is the most beautiful thing in our school?”Without hesitation（犹豫）I said,“It is the20.”