Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the conversation
What is NOT mentioned when Maggie is talking about her experience in Ocean Park

A．10 o’clock tonight;
B．2 o’clock in the morning.
C．2 o’clock in the afternoon.
D．10 o’clock in the morning.

A．explain the derivation of the word "tip"
B．illustrate why difficult customers give bad tips
C．put forward reasons for a salary increase
D．indicate how one can get better service