The key answer of exercise 3

a)

1. 80% usually
2. 40% sometimes
3. 60% often
4. 10% hardly never

b)

1. after
2. before

c)

1. A real friend often helps you with problems.
2. Real friends always understand each other.
3. A real friend is sometimes a brother or sister.
4. Real friends never ask about personal things.
5. Real friends hardly ever disagree.
6. Real friends are usually the same age.