短文改错。

例：Jim get up at seven in the morning.     Gets

    Different people like to do different things in their free time. Do you want to know what I do in my free time? I do lot ____ of things in my free time. First I like to listen to music. It make ____ me relaxed. but ____ happy. My favourite singer is Zhang Jie. I can sing most of his song____ . I aso like to watch TV. And I think watch ____ TV can help me learn a lot more outside class. Sometimes I go swimming and ____ my mother. She is good at swimming. I hope I can swim as better____  as you ____ someday. When I'm not busy, I also like to play the violin with my friends.it's quiteinterested____ .As you see, I have great funny ____ in my free time. What about your ？Free time Activities? Can you tell me?

圆的周长总是直径的____倍多一些，圆的周长和直径的____叫做圆周率，用字母____表示

在平直的公路上，一辆汽车正以20m/s的速度匀速行驶，所受阻力为5×10³N．因前方出现事故，司机立即刹车，直到汽车停下，已知汽车的质量为3×10³kg，刹车时汽车所受的合力为1.5×10⁴N，求：