Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage
The general tone of the passage is one of ______.

A．The building needs more breath.
B．Too many pollutants and moisture.
C．The building has been overused.
D．People don’t take good care of it.

A．Waiters and waitresses usually get low wages.
B．A $ 3.00 tip is usually expected for a meal of $ 20. 00.
C．Waiters and waitresses often get best tips from customers they work most for.
D．Good tipping can help customers get quick service.