cost 是成本的意思， spent是花费的意思， took是拿的意思， 而used 则是用过的意思，区别可以从以下例子看出：

I don't know how much cost， I have spent 2 thousands， after I took it， I found it is used one. 我不知道成多少钱，我花了2千，拿了之后才发现是用过的。