The key answer of exercise 2

a)

1. c
2. f
3. k
4. e
5. a
6. g
7. b
8. d
9. h
10. i
11. j

b)

1. offer to pay → 5b
2. share the bill → 5c
3. shake hands → 1a
4. go out on a date → question 5
5. kiss someone on both cheeks → 1c
6. take someone home → 6c
7. hug each other → 1d
8. insist on paying → 5b
9. refuse an invitation → 7a
10. invite someone to your house → question 3
11. pick someone up → 6a