A. He shouts at the waiter. B. He whistles to the waiter.
C. He makes some noise by pounding on the table.
D. He makes eye contact with the waiter and nods his head.

A. Tea houses are only open at night.
B. Tea houses are where ordinary people like to hang around.
C. Some tea houses are destinations for high-brow social life.
D. Tea houses have even changed the way people do business.