I know the boy_____father is model worker.

I know the boy_____father is model worker.
I know the boy _____will take part in the meeting.
I know the boy ____my father talked about just now.
I know theboy the father____is a model worker.
I know the boy of ____the father is a model worker.
I know the boy ____my brother used to be ten years ago.
I konw such a boy ____you talked about just now.