在太阳系中，唯一的恒星是（　　）

设$m={\int }_{-1}^1\sqrt{1-x^2}dx$，若将函数$f\left(x\right)=\sin \left(\omega x+\phi \right)$的图像向左平移$m$个单位后所得图像与原图像重合，则$\omega$的值不可能为（  ）

    Nowadays more and more Chinese teenagers find life more difficult without their parents. They don't know how ____housework. Because their parents do almost everything for them at home. This is a big problem.

    Joy is 14 years old. One day her parents____away on business(出差), so they asked Joy ____home alone. At first she thought she would be happy ____her parents were not in. She could do what she liked. But it was six o'clock ____the afternoon, she felt hungry.“Oh, it's time ____supper. Where can I get my food?”she said to herself.Later she found some food in the fridge, but she didn't know how to cook.At that moment, she missed her____very much. At last she could only go to the supermarket and____some food to eat.

    Many teenagers are the ____as Joy. So I think they should learn some basic life skills,____as cooking, cleaning their rooms or dressing themselves properly. They shouldn't depend too much on their parents.