Change the voice

a) the principal choose him captain of the team.

b) the plan wasn't approved of by them.

c) do the scientists understand everything about life.

d) I would prefer to be taught by him.

e) we heard her singing a song.

A. The principal said he was the captain of the team.

B. The plan had not been approved by them.

C. Do scientists really understand all there is to understand about life?

D. I want to be taught by him.

E. We saw her singing the song.