Помогите решить. 13 не надо !!!

1. He got up at seven oclock yesterday
2. I was playing the piano at five oclock yesterday
3. He began to do his homework at four oclock yesterday
4. She was washing the floor at four oclock yesterday
5. I met Nick at three oclock yesterday
6. When I came home, Kate was playing the piano
7. When I met John, he was going to the railway station
8. When I was going to the museum, I saw a big crowd of people in the street
9. They played in the yard in the evening yesterday
10. They were playing in the yard the whole evening yesterday
11. I was cleaning my teeth at eight oclock in the morning yesterday
12. We went to the wood in summer
14. She fell asleep at eleven oclock yesterday
15. When the teacher opened the door of the classroom, the pupils were sitting at their desks
16. Father was watching TV at ten oclock yesterday
17. I went to bed at nine oclock yesterday
18. I finished my homework at nine oclock yesterday
19. Father came home at six oclock yesterday
20. Mother was drinking tea at eleven oclock yesterday