Помогите, пожалуйста, сделала, но не факт, что верно.Insert prepositions of time

Помогите, пожалуйста, сделала, но не факт, что верно.

Insert prepositions of time (at, on, in, for, since, by, till, from) where necessary.

I am very busy now, but I will be with you ____ a moment.

Does he work ____ Saturdays?

We didnt understand the text ___ first, but at the end we managed to translate it.

She will have written a composition ____ 3 oclock.

Jill and Jack always go out for a meal ____ their wedding anniversary.

He started learning English ____ the age of five.

The train service is very good. The trains are always ___ time.

Jazz became popular in the US ___ the 1920s.