The correct sentence is one which has correct form of verb and used and the form of voice is according to the sentence requirement.
The correct answer to the question are following:
The answer to all 5 questions are given below:
1. D. It is thought that he has died a natural death and He is thought to have died a natural death.
2. C. John is said to be to be the brightest student in class.
3. D. Does he realize that he is being laughed at?
4. D. The manager had several jobs done.
5. A. We found that the soccer match had been cancelled.
The correct sentence for the given statements in the question are given above. There are two different forms of sentence voice, active voice and passive voice.
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