按要求写单词。

①she ____ (宾格)②country____ (复数③close____ (现在分词）④three ____ (序数词）⑤China____ (形容词⑥I ____(名词性物主代词）⑦boy____ (复数)⑧swim____ (现在分词）⑨photo____ (复数)⑩mouse____ (复数）

一放在光滑水平面上的平板车，高为0.2m，质量为3m，平板车停靠在一光滑的四分之一圆弧轨道旁，平板车上表面刚好与圆弧轨道的最低点相切，一质量为m的物块从圆弧轨道上某点由静止释放，滑到圆弧轨道最低点时，对轨道的压力为2mg，物块滑上平板车后，再从平板车的右端滑离落到地面上时，离平板车右端的距离为s= $\frac{2}{15}$ m．已知物块与平板车间的动摩擦因数为μ=0.2，圆弧轨道的半径为R=0.4m，重力加速度为g=10m/s²，求：

    It's Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They're singing and dancing. What are those women doing? They are drinking tea. Look at the woman in a blue coat. Who's she? She's my mother. She is talking to Edward. Edward is her student. He is a good student. He studies hard. He's good at all the subjects. And he's friendly to all his teachers and his friends.

一组合体的三视图如图所示，该组合体是由哪几个几何体组成，并求出该组合体的表面积（单位：cm²）．