2.has the most valuable painting been stolen by the thieves in the national museum?
3.Is english taught(by them) here?
4.were some exercises given by the teacher?
5.is a big cake being made for the party by her?
6.has the work been finished by him?
7.will the children be brought by the buses?
8.will mary be invited to the wedding party(by you)?
9.has the window of the lab been changed(by them)?
10.is the chicken fed twice a day(by them)?