Вставьте at/on/in.

Решение:

1. on 6 June
2. at 8 o'clock
3. on Wednesday
4. at 12.30 a.m.
5. in 1977
6. in September
7. on 24 September
8. on Friday

Ответ: on, at, on, at, in, in, on, on.