The answers can be as follows :
1. It can't be denied that he is clever .
2. I remember being given a present like this by my father .
3. I hate people making fun of me .
4. He is said to have worked in a big firm.
5. It is said that he writes short stories.
6. He wasn’t expected to insult his brother.
7. It is alleged that two men were arrested after the explosion.
8. The book wasn’t expected to be so expensive.