There is only one ball pen in the pencil box.是由名词做的定语,请问哪一个是定语呢?

There is always only one truth! There is always only one truth There is just only one turth There is only one me in this There is only one good,knowledge,one evil,ignance. there is only one stop here.对only one 进行提问[ ] [ ] stops are there here？ There is only one cake left,sir为什么不是There is only a cake left,sir There is only one bag in the room.对划线部分only one提问 There is only one T-shirt in the living room对only one提问 there is only one picture on the wall 对only one 提问 there is only one sheep on the farm.对only one提问 There is only one glass on the table.对only one提问 there is only one cup on the table,only one画线 对划线部分提问 There is only one woman teacher in the office 对only one 提问 There is only one box on the table对only one提问 现在就要 There is only one glass of milk.only one画线(提问) There is only one library in our school.(对划线部分only one提问) there is only one family here（对only one提问）