Put the verb in brackets into the correct form of the Past Simple Passive. (Поставь глагол в скобках в нужную форму времени в пассивном залоге.)

1. The house
50 years ago. (to build)
2. My sister
by a dog last month. (to bite)
3. How much water
? (to pollute)
4. The door
by a man. (to open)