on) my dream

I dreamed of my boyfriend ……….. (at,in,on) my dream
My friend’s birthday is ……………… (at,in,on) June
Sometimes it snows ………………..(at,in,on) winter
We went to see a movie last night. It was really cold ……… (at,in,on) the cinema.
Two people were injured in the accident and are still …………… (at,in,on) hospital
Our flight was delayed. We had to wait …… (at,in,on) the airport for three hours
I didn’t expect you to be ………(at,in,on) home. I thought you’d be …… (at,in,on) work