Read and choose the correct preposition

1. He always has dinner with his family [at|in|on] Christmas Eve.
2. Sochi is beautiful [at|in|on] spring.
3. I don't have classes [at|in|on] Sunday morning.
4. She doesn't like studying late [at|in|on] night.
5. They always go to the cinema [at|in|on] New Year's Eve.
6. Pupils have holidays [at|in|on] the autumn.
7. Let's meet him [at|in|on] half past six.
8. Her birthday is [at|in|on] the first of May.
9. People give each other presents [at|in|on] New Year.