Here are the correct prepositions filled in:

1. **on**
2. **at**
3. **in**
4. **in**
5. **at**
6. **in**
7. **in**
8. **at**
9. **in**

So the complete text would read:

"My birthday is **on** the 30th of July. Last year I had a great day. I got up **at** 8 o’clock **in** the morning and tidied the house. Then **in** the afternoon I went into town with my friend to buy food for the party. The party started **at** 7 o’clock **in** the evening and didn’t stop until very late **in** the night! **At** the 31st of July I was very tired, so I went to bed early **in** the evening."