Change there sentences into the passive voice:
1.people should send their complaints to the main office
=> Their complaints should be sent to the main office
1.people should send their complaints to the main office
=>Their complaints should be sent to the main office
Chúc bạn học tốt 
Somebody my steal your car if you had left the keys in it.
A short circuit could cause the fire
Lan is going to invite her friends to her birthday
Lien couldn't open the door of the classroom
they should announce that news as soon as posible
đề bài như bai tren
Câu Hỏi: Change there sentences into the passive voice:
people should send their complaints to the main office.
Trả lời: Their complaints should be sent to the mani office.
