Предложения в пассивный залог

How much money was stolen?
most of the earth's surface is covered by water
has your room been painted?
we must do something, so the problems are avoided
a new hospital has been built near the airport this year
we are not advised to go there so often
how is this machine used?
when i arrived the room was being cleaned by somebody
when we got to the stadium, we found out that the match had been cancelled
the music could be heard from afar.