Переделайте следующие предложения, употребив глагол в пассиве. пользуйтесь образцом: they invited him = he was invited. 1. they will carry out this experiment next week. 2. he wrote this book 10 years ago. 3. they've asked him a lot of questions. 4. somebody has left all the documents in the office. 5. one praises a pupil when he works hard. 6. people will forget him in a few years’ time. 7. somebody built this house last year. 8. they will discuss his paper tomorrow. 9. they have opened the conference. 10. someone has typed all the texts. 11. nobody heard the sound. 12. people always admire this picture.

The experiment will be carrying out next week.
The book was written 10 years ago.
He has been asked a lot of questions.
All the documents has been left in the office.
A pupil is praised when he works hard.
He will be forgotten in a few years’ time.
This house was built last year.
His paper will be discussed tomorrow.
The conference has been opened.
All the texts has been typed.
The sound wasn`t heard. 
This picture is always admired. 
Возможно в некоторые предложения стоит добавить уточнения вроде "by people" или "by somebody". Это уже на ваше усмотрение.