Переведите с активного в пассивный залог,пожалуйста...Очень надо:
1.my students have written some of the best essays
2.everybody can visit the exhibition from 9 am to 4 pm
3.he didn't pay the bill on time
4.they have pulled down the old cinema
5.people were thinking about all possibilities
6.the government must deal with the problem of unemployment
7.the student's parents have closed the school
8.the central Hospital staff are treating the victims of the accident

Привет!1) Some of the best essays have been written by my students.2) The exhibition can be visited by anyone from 9 am to 4 pm3) The biil wasn't paid on time by him.4) The old cinema have been pulled down by them.5) All possibilities were thought about by people.6) The problem of unemployment must be dealt with by government.7) The school has been closed by student's parents.8) The victims of the accident are being treated by the Central Hospital staff.