The key answer of exercise 3

a)

1. seeing
2. to describe
3. to send

b)

1. a) I remembered, then I set the alarm. It was my responsibility to set the alarm.; b) I remember now that I thought then that the building seemed very quiet.
2. a) | forgot that I needed to buy the tickets, so I didn't do it.; b) I'll always remember the concert that I saw.
3. a) Henri stopped first because he wanted to drink some coffee. He stopped and then he drank.; b) He didn't continue driving.
4. a) Billy finished the training and later became a famous dancer.; b) Billy continued practising every day.
5. a) He made an effort to recall her name.; b) He experimented by going through the alphabet to help him remember.
6. a) We're sorry that we have to give this bad news.; b) I'm sorry I spent so much money on the ticket.

c)

1. b
2. a
3. b
4. a
5. a
6. b
7. b
8. a
9. a
10. b
11. b
12. a