Rewrite the sentences using passive voice(пассивный стан)1)They received a patent for

1) They received a patent for the invention of this medicine fifteen years ago. - A patent for the invention of this medicine was received by them fifteen years ago. - Патент на изобретение этого лекарства был получен ими пятнадцать лет назад.
2) Who discovered the penicillin? - Whom was the penicillin discovered by? - Кем был открыт пенициллин?
3) They are introducing new software now. - New software is being introduced by them now. - Новое программное обеспечение внедряется ими на данный момент.