客房已经全部被预订出去了,你建议客人使用等待名单,当有客房取消第一时间通知客人。 The hotel is fully booked now。 You suggest putting the guest's name on the waiting list. When there is a cancellation, you will inform him.
【单选题】To understand the culture of different places, especially ______ containing as many different subcultures as the United States, is necessary for everyone in today's internet world.