AT, IN, ON in time expressions

We are going to be on a beach on the coast ___ four months.

If you want, we can meet ___ dinner time and talk about it.

I am usually very busy ___ the morning, so please call after 5PM.

Are you free ___ Friday night? We could go to a party.

___ just a few minutes the people will see who the new president is.

She was born ___ September 5th 1986.

I prefer to do this course ___ winter, as I do not have anything else planned.

I prefer to study during the day but my brother would rather study ____ night.

I still don´t know what we are going to do ___ Easter. Hopefully something fun.

I need to have this project finished ____ Monday morning or I will be in trouble.