Câu 19.
Who wrote it?
By whom was it written?

c16) The paintings will be exhibited by the organizers till the end of the month.
c17) The electrician has already been paid for his work.
c19) By whom was it written?
c20) A special edition for children has been written by the author.

16. The paintings will be exhibited by the organizers till the end of the month.
17. The electrician has already been paid for his work.
18. She was stung by a jellyfish
19. By whom was it written?
20. A special edition for children has been written by the author.
21. These articficial flowers are made of silk
22. A lot of the work is being done by students
23. A clock was given to her