1. He practices Chinese with their friends every day.
Chinese is practiced by him  with their friends every day.
2. They are going to destroy the tower next week.
The tower.......is going to be built next week.
3. Mr Pike designed this monument in 2005.
This monument ...........was designed by  Mr Pike  in 2005.
4 They have just repainted the flat.
This flat.........has just been repainted
5.She has helped her parents
Her parents ..have been helped  with housework recently.