Chuyển các câu với động từ tường thuật sau sang câu bị động

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V. Chuyển các câu với động từ tường thuật sau sang câu bị động
54. They think that he has died a natural death.
55. Some people believe that 13 is an unlucky number.
56. They say that John is the brightest student in class.
57. They reported that the President had suffered a heart attack.
58. I knew that they had told him of the meeting.
59. They declared that she won the competition.
60. They rumored the man was still living.
61. People think that Jack London's life and writings represent the American love of adventure.