Questions 56-58 refer to the following conversation with three speakers.
W1: Can I ask you guys a favor? 56 I’m scheduled to wait tables on Monday from 7 A.M. to 3 P.M., but I have a doctor’s appointment at noon. 57 Could someone possibly cover my breakfast shift?
M: Sorry, Heather, but I can’t. I’m off both Monday and Tuesday this week.
W1: Oh, thanks anyway.
M: I wish I could help.
W1: Olivia, do you think you could do it?
W2: Well, I start my shift at 11 A.M. that day. What time do you think you can be here?
W1: I don’t expect the appointment to last more than an hour, so I’m sure I’ll be in by about 1:30 P.M. Does that work for you?
W2: You bet. 58 Maybe you could cover one of my shifts next month when I go on my camping trip.
字彙：schedule 排定 / wait tables 餐廳服務生上餐 / shift 輪班 / cover 代班、代替 / You bet. 當然。
56. What best describes the speakers’ jobs?
(A) They are medical staff.
(B) They are cashiers.
(C) They are office employees.
(D) They are restaurant servers.