Read the text again and find two more examples for personal and impersonal passive as in the example.
Personal Passive:
e.g. Advertising is said to be a fascinating blend of psychology passion and propaganda.
1 So, is it really necessary, important or effective as it is said to be?
2 Advertising is thought to be crucial for the business on the whole.
Impersonal Passive:
e.g. It’s also said that more than $500 billion a year is spent on advertising worldwide today.
1 Surprisingly, it has been revealed that US pharmaceutical companies spend twice as much on advertising as they do on research by a York University study recently.
2 It is said that the art of advertising dates back to cave paintings in the prehistoric ages.