Do we use these time expressions with in, on, or at?

1. at ten o'clock, 2. on Monday, on Tuesday, 3. on Monday morning, on Tuesday afternoon, 4. at the weekend, 5. at Christmas, at Easter, 6. in January, in February, 7. in May, in June, 8. in the summer, in the winter, 9. in 1990, in 1992, in 2001.