The key answer of exercise 3

a)

1. First of all
2. because
3. because
4. Then
5. so
6. and
7. Finally
8. but

b)

First of all, I left the house late because I lost my keys. Then I missed the bus, so I phoned a taxi but the taxi broke down and I waited thirty minutes for another taxi. After that, I got to the restaurant an hour late, but I left your present in the taxi. I phoned the taxi company, but they didn't answer, so I went into the restaurant, but you weren't there. Finally, I went home and tried to phone you, but you didn't answer.