Oh, boy, why are you killing your time this way? Can you find something else _____ doing at all?

1. A.
   cost
2. B.
   bargain
3. C.
   worth
4. D.
   value

Oh, boy, why are you killing your time this way? Can you find something else _____ doing at all?

[　　]

A．cost　　　B．bargain

C．worth　　 D．value