Where do you live? Why we ask other people with"Where do you live" rather than"Where do you live in"

Sports My parents and I all like sports.Mom like climbing mountains.She goes hiking once she's in holiday.She has already climbed all mountains in Beijing this year,like "Bai hua mountain","Feng huang mountain","Miao feng mountain"and so on.I'm proud of her.Once she says something,she will do it without hesitation.(How can I describe her by using a adj?) Dad like doing all kinds of sports.He graduated from a Kungfu school.He has many muscles.I think he's handsome.Haha. Now I will say somethings about me.I'm a girl who like doing sports at outdoor.I like basketball,but I am not able to play.It's a pity.I want to play,but there are not many girls playing basketball around me.I will graduate from the high school,and I plan to learn taekwondo then.I also go hiking with my mon sometimes. Today is the day when China was founded.All people are in holiday.It's a festival.All my family went hiking.It's so cold there.But we felt hot after we started.It's an exciting experience.