A、Colleagues. B、Dentist and patient. C、Boss and secretary. D、Teacher and student. B

M: What a nuisance! I need to buy something for the party but the supermarket is closed.
W: Look, the sign says it is open from 7 a.m. to 9 p.m. on weekdays and from 8 a.m. to 10 p.m. on weekends.
Q: How many hours does the supermarket open on Sundays?

M: Come on. Open your mouth. Don’t be so nervous! I can’t give you the injection with your mouth closed.
W: I’m not nervous. I... I just hate needles, you know.
Q: What is the possible relationship between the two speakers?