A.who are you? B.don't ask me. C.I don't know. D.would you please ring them up this afternoon?
A.This is Jim. Who's speaking, please? B.I'm afraid I won't be free. C.This is the right number. D.There's no hurry.
A.I am fine. B.I am not sick. C.I am a student from Bonn University. D.I came from Bonn University.