dear teacher Yu,
I am so sorry that i lost your U dick last week because of my carelessness.i know there might be some important stuff in it,but you didn't blame me and i feel so guilty about it.i have searched every cornor in my house,but still can not find it.i am almost crazy for it.As your class representative,i know i am incompetent and careless for losing your U disk.Anyway,i try my best and still cannot find it.To make up my mistake,i bought a new one for you.i know there might have very important infomation in your last one,but please accept the new one as my apology.
anyway,I feel very sorry about it.a student who made a big mistake.