找错误并改错：

I ride my bike in Sundays.

____

如图所示是人体某部位结构，该图表示的部位及其运动中的作用分别是（　　）

    John gets up early from Monday to Saturday, because he must go to school before 7:30 on weekdays(工作日) and go to Drawing Club at 8:00 on Saturday mornings. He usually goes to the bookshop on Saturday afternoon, and after dinner he watches TV until(直到) midnight(午夜).

    He doesn't get up early on Sundays. John's parents both work on Sundays. John always watches TV after he gets up. Then he usually goes to KFC to have a hamburger and some juice for lunch. After that, he goes back home and starts to play computer games until his parents come back. He does his homework after dinner. He usually has lots of weekend homework, so he must spend three hours on it. He usually goes to bed at about 11:00 p.m. on Sundays. He often complains(抱怨) he has too much homework to do.

根据短文内容，选择最佳答案。