阅读下面材料，在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。
Some students who had graduated visited their university professor. The conversation soon turned into complaints about stress in work and life. To offer his guests coffee, the professor     (go) to the kitchen and returned with a pot of coffee and     variety of cups—porcelain, plastic, glass, some plain-looking, some expensive—telling them to help     to the coffee.
   was when all the students had a cup of coffee in hand that he said, “All the nice-looking expensive cups have been taken up,     (leave) behind the plain and cheap ones. Actually, the cup itself adds no quality to the coffee.     all of you really want is coffee, not the cup.You consciously went for the best cups,     then you began eyeing others’ cups.”
“Now consider this Life is the coffee; the jobs, money and position in society are the cups,       are just tools to hold and contain life. The type of cup we have does not change the quality of life . If we concentrate only     the cups, we fail to enjoy the coffee. I     (true) hope that you will never let the cups drive you ... enjoy the coffee instead.”