Answer:
I have an eye, but I can't see. I usually have to work with something in my eye. What am I?
I go around in circles, but always straight ahead, never complain, no matter where I am led.
I fly forever Rest never.
The dirtier I get, the whiter I am. What am I?
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.