Ответ:
1. Some people rest in the afternoon.
2. We celebrate different fests in October.
3. This program is on only on Saturday.
4. We decorate a fir tree at Christmas.
5. They built this school in 2002.
6. The weather is usually cold in January.
7. People go to church at Easter.
8. The cartoon starts at 13:45.
9. The sun shines brightly in July.
10. I can meet you on Monday afternoon.
11. My cousin was born in 2005.
12. A week starts on Monday.
13. We did not work --- last week.
14. I usually take my dog for a walk at 12:00.
15. We work hard in the morning.
16. I do not work at night.
17. I will send you a letter --- next month.
18. The beach party is on 4th August.
19. The train leaves at 5:35.
20. We are usually tired in the evening.