根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。
Xiao Qiang, a 12- year-old Chinese boy, has too many activities. His father 1 him away from school four afternoons a week and drives him across town to practice. "I do most of my 2 in the car when we are 3 to practice, and I have to do the rest when I get home. I am too tired. I just want to sleep." He said.
"More and more kids become unhappy 4 they have too many activities to do." aid Mr. Wang, an expert of child development. "41% of the children aged 9－13 said they felt 5 most of the time, and more than 75% of them said that they wished they had more 6 time to play.
"Overscheduling is a growing problem for Chinese families." said Mr. Wang. It is not good for both kids and their parents. More families eat dinner 7 or often eat fast food 8 their way to football practice or music lessons. We all know it is important for kids to learn how to relax. If they don't learn that now, it will be more difficult to learn when they get 9. Kids need time to relax. Parents should 10 about what is right for kids.
，则x的值是（ ）