单项选择题
A．buy a monthly pass B．ask about the fare first C．agree on the amount of the tip D．pay by the exact change in coins
A．eat their food slowly B．help the host serve food C．serve each other at the table D．help themselves to more food
A．while the guests are having small talks B．when all the guests have arrived C．after the guests finish small talks D．after the dinner comes to an end