The key answer of exercise 3

a)

1, 2, 4, 6 (in some cultures) and 8 are compliments

b)

1. You've got beautiful eyes.
2. I admire your honesty.
3. You cheated in the exam.
4. I want to get my hair cut like yours.
5. We won't be late.
6. You look as if you've lost weight.
7. I'm going to reduce your salary.
8. It's a long time since l've eaten such delicious food.