1. 听录音，回答问题。

1. （1） What does David do in the bathroom?

   A . He does cleaning. B . He gives people towels. C . He makes sure people tip the waiter.
3. （2） How much should Sam tip David according to the woman?

   A . One dollar. B . Two dollars. C . Twenty dollars.
5. （3） How often should Sam go to the building?

   A . Five times a week. B . Twice a week. C . Once a week.