Determine which exchanges are about particular contexts in Exercise 6b.

1 - Excuse me! - Getting someone’s attention (6a:1), 2 - Pleased to meet you. I’m John. - Introducing oneself (6a:2), 3 - Is this seat taken? - Offering or confirming a seat (6a:3), 4 - Make yourself at home. - Welcoming someone (6a:8)