问题补充：
The leader of the factory told us that very little was made of the waste material in the past.
A. cost
B. value
C. use
D. matter
答案：
A. cost
B. value
(答案→)C. use
D. matter
解析：此处cost 花费；value价值；use 用途；matter事情。本句是make use of的被动语态形式。原句可改写为：we made very little use of the waste material in the past.将其变成被动形式为：very little use was made of the waste material in the past. 故选C。句意：这个工厂的领导告诉我们，在过去这种废料很少被利用。
