请把下列句子翻译成英文，要使用被动语态

1.This factory was finised last year.
2.Should this job be finished?
3.Classroom is cleaned by us.
4.He was asked a question by the teacher.
5.These books can't be sold.
6.These aged is taken good care of.

(1) The factory was built up last year
(2) This work must be completed?
(3) We have been cleaning classrooms clean.
(4) He was asked a question by the teacher
(5) These books can not be sold.
(6) The old man is carefully looked after.

The factory was builted last year.
Should the work has to be finished?
The classroom has already be cleaned up by us.
He was asked a question by the teacher.
these books can`t be sold out.
The old man is being taken good care of.