turn the following sentences into passive 
----- Nội dung dịch tự động từ ảnh -----
41. Somebody has taken my briefcase.
42. The teacher returned our written work to us.
43. She had finished her report soon.
44. The mad dog bit the little boy.
45. The police have arrested five suspects.
46. The doctor ordered him to take a long rest.
47. Lightening struck the house.
48. A group of students have met their friends at the railway station.
49. They didn't allow Tom to take these books home.