Przerobić na Passive Voice: Who invented the telephone? Who has written this poem?

Who was the telephone invented by ? Who had the poem been written by ?

By whom was the telephone invented? By whom has this poem been written? albo Who was the telephone invented by? Who has this poem been written by? ale dla obcokrajowca to by brzmialo dziwnie i na pewno oni nie zamienialiby tego na passive voice, ale coz powiedz to swojemu nauczycielowi hehe :))