1 => A lot of pollution have been caused by wastes from chemical factories
2 => A lot of patients is being looked after by that young doctor
3 => The thieves is believed to have got into the house through the window
4 => When does his homework usually be done?
5 => I got my clothes washed by Nam
6 => Mrs. Hoa had the meal cooked by her daughter
7 => He is said to be intelligent
8 => The wall is being painted in the school
9 => Many different paper products have been developed
10 => We were asked many difficult questions
11 => The road must be widen soon
12 => I was advised to reuse milk bottles by her
13 => He used to be helped