Ex 9: 1, Jeans are sold all over the world
2, Jean cloth was made from cotton in the 18th century
3, Rice is grown in tropical countries
4, Five million bottles off champagne will be produced in France next year
5, A new style of jeans has just been introduced in the USA
6, Two department stores have just been built this year
7, This exercise must be done by you carefully
8, The problem can be solved by us
9, Experiments on animals should be stopped
10, Life on another planet might be found 
11, All the school in the city have to be improved by us
12, A new bridge is going to be built in the area

Ex 9. 

1.Jeans are sold all over the world
2.Jean cloth was made from cotton in the 18th century
3.Rice is grown in tropical countries
4.Five million bottles off champagne will be produced in France next year
5.A new style of jeans has just been introduced in the USA
6.Two department stores have just been built this year
7.This exercise must be done by you carefully
8.The problem can be solved by us
9.Experiments on animals should be stopped
10.Life on another planet might be found 
11, All the school in the city have to be improved by us
12, A new bridge is going to be built in the area