--- May I use your mobile phone?

--- _________ .

------- May I use your mobile phone?       --------- _______________

--- May I use your mobile phone?

--- _______________

1. A.
   why not?
2. B.
   OK, enjoy yourself.
3. C.
   Go ahead.
4. D.
   Yes, but you’d better not.

 --- May I use your mobile phone?

   --- _________ .

  A. Why not?                                        B. Go ahead.             

C. OK, enjoy yourself                               D. Yes, but you’d better not.