Ex1:

1.came,had finished

2.had met

3.went,read

4.not to wear

5.has started

6.listened,had done

7.had gone,went

Ex2:

-Before we took a look around the shops, we had lunch.

-When we got out of the office,the light has gone out.

-By the time she explained everything clearly,we had started our work.

-Before my mother went home, my father had watered all the  plants in the garden.

Ex3:

1.This flower is watered by my father every morning.

2.Fiona was invited to John's party by him last night.

3.The dinner is being prepared by my mother in the kitchen.

4.Our teeth should be cleaned twice a day by us.

5.The English grammar has been explained by our teacher.

6.The accident in this city was caught by some drunk drivers.

7.Tom's parents will be visited by him next month.

9.Was this beautiful dress bought by Mary?

10.These old pictures won't be hung in the livingroom.