Przyimki: on, in, for, at

Przyimki on in for at
The first landing the moon was 1969.
My grandparents were married more than fifty years.
When I was Berlin last year, the weather was very cold.
How many people were there the party?
Where were you Saturday evening?
It was a beautiful day August.
My family and I were holiday the seaside.
Disco music was very popular the nineteen-seventies.
My brother graduated last year. He was Glasgow University.
When I was school, my parents often helped me with my homework.
I worked a cinema for a big computer company the nineties.