UNIT 3. YOUR PREFERENCES » Стр.148 (5)

Change the sentences using passive structures. 1. Books were written by hand in ancient times. 2. A lot in history was changed with the invention of printing. 3. People are helped by librarians to find books on any subject. 4. Visitors’ reading preferences are developed by thematic books selections. 5. The main characters were introduced by the author only in the 2nd part. 6. The topic was discussed two days ago. 7. The walls were coloured in green and yellow stripes. 8. The series of books were published last year.