Сделала, но не факт, что правильно. 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 didn’t understand the text first, but at the end we managed to translate it. she will have written a composition 3 o’clock. 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.

I am very busy now, but I will be with you in a moment.
Does he work _on_ Saturdays?
We didn’t understand the text _at_ first, but at the end we managed to translate it.
She will have written a composition _by_ 3 o’clock.
Jill and Jack always go out for a meal _on_ their wedding anniversary.
He started learning English __at_ the age of five.
The train service is very good. The trains are always _on__ time.
Jazz became popular in the US __in_ the 1920s.