Chuyển sang bị động

CHUYEN SANG BI DONG
8. They couldn’t open the door of the room. =>

9. Lan’s parents have to clean up the house before Tet holidays. =>

10. They were making a big cake at 5 p.m yesterday. =>

11.  People grow tea in Phu Tho. =>

12. They are repairing her car now. =>