1.The book was written by Mark Twain.
2.A nice toy car has been bought by my mother for my twin brother.
3.A moment ago,the keyboard was connected to the computer by him.
4.That CD was designed by Nancy.
5.A strange machine was made by Uncle Sam last week.
6.Is cotton grown by you in your hometown?
7.Japanese is spoken by few people here.
8.Stamps are used by us to send letters.
9.The dog was drawn by Millie on the blackboard.
10.Printers are sold by them in the shop.
11.English is spoken by the people in Australia.
12.Is your classroom cleaned by you every day?
13.Tea is grown by us in the south of China.