Time is tangible. One can gain time, spend time, waste time, save time, or even kill time. Common questions in American English reveal this concrete quality as though time were a possession. “Do you have any time?”, “Can you get some time for this?”, “How much free time do you have?” __________________________________.

Generally, Americans are taught to do one thing at a time and may be uncomfortable when an activity is interrupted. In businesses, __________________________________are common practices. Appointment calendars are printed with 15-,30-, and 60-minute time slots. The idea that “there is a time and place for everything” extends to American social life.  __________________________________. Thus, calling friends on the telephone before visiting them is generally preferred to visitors’dropping by.

Useful words and expressions:
tangible 切实的
kill time 消磨时间
reveal 显示，揭示
scheduling 行程安排
slot 缝隙
drop by 随便访问
preferred 首选的
答案：