14. The thief was easily captured by the police

15. The money was returned by John last night

16.The room was filledby smoke

17. That book was taken from the desk by Bob

18. A dacing class was started last week

15. The money was returned by John last night
16.  The room was filled with smoke.
17. That book was taken from the desk by Bob.
18. a dancing class was started last week by them.
19. the accident was seen by Mr.Smith
20. our written work was returned to us by the teacher
21. For the time being, that group is being taught by Alice.
chúc b học tốt