Ответ:
exercise 1
1. She is being told an interesting story.
2. We will be given some apples.
3. The rule had been explained to the students before the lesson was over.
4. I was asked a difficult question.
exercise 2
1. was decided
2. The film has been already shown on TV.
3. are sold
4. will be received
exercise 3
1. The girl has already taught music for five years.
2. produced
3. is making
4. was being decorated