急!将下列句子改成被动语态,帮忙!

1.All the work are finished by us
2.The problems got worked out by him
3.History are made by people
4.Alot of questions are asked by people at the meeting.
5.His singing is heard by us in the next room
6.The thief enters the building is seen by us
7.He is said to be honest by people