The key answer of exercise 2

a)

It means that people are more open, that they are more likely to talk about their experiences, both good and bad.

b)

four secrets:

• how much her father earned
• that a girl was going out with another girl's boyfriend
• accidentally telling someone what their Christmas present was
• a romance with another man

c)

1. His daughter telling people how much money he earned.
2. Yes, she was.
3. What her husband had bought her as a Christmas present.
4. Yes, she is.
5. Secrets that protect somebody or something in a way that wouldn't damage them when they ultimately find out.