Помогите упражнением 148

1 Children usually begin school on the first of September.
2 Last year we began school on the second of September.
3 Tomorrow our lesson will begin at eight o'clock.
4 The children always wear uniforms when they are at school.
5 I can't find my sister.
I will try to help you. What did she wear ?
6 I was busy yesterday. I came home. I had dinner and did my homework.
7 Are you busy now? What are you doing?
8 it is 4 o'clock. Mike is playing chess now. He always plays chess at 4 o'clock.