注意：1).词数100左右；

2).可适当增加细节，以使行文连贯；

Dear Li Hua,

    As a freshman in high school,I badly need your help with my sleep problem.The school rule goes that for every dormitory（宿舍）,students are only allowed（被允许）to keep the lights on before 10:40 p.m.So we should all go to bed after 10:40.However,one of my roommates（室友）often washes her clothes as late as 11:00 p.m.,and some others even turn on their flashlights（手电筒）to do homework.The noise and the light really make it hard for me to fall asleep（入睡）,I want to tell them to stop it,but I worry it will harm our relationships.What should I do?

Yours,

Sarah

这次运动有一个政治纲领，它提出的六条要求中有五条后来都逐一实现了，列宁评价这次运动是“世界上第一次广泛的、真正群众性的、政治性的无产阶级革命运动”．这次运动是指（　　）       

在ΔABC和ΔA′B′C′中，∠B=∠B′，下列条件不能判断这两个三角形相似的是（    ）

已知双曲线C₁、C₂的顶点重合，C₁的方程为$\frac{x^2}{4}$-y²=1，若C₂的一条渐近线的斜率是C₁的一条渐近线的斜率的2倍，则C₂的方程为____ 。