Put the following sentences in to the passive voice: they built this house in 1950. 2. somebody locked the front door. 3. someone broke my pen last night. 4. they punished the boy for that. they finished their work in time.

1.This house was built in 1950.
2. The front door was locked (/by somebody/?).
3.My pen was broken last night.
4.The boy was punished.
5.Their work was finished in time.