3.
A. I don' t think so
B. Very good
C. Of course not
D. Not at all
4.
A. Never mind.
B. Take care
C. Here it is
D. This way, please
5.
A. Yes, I am.
B. OK.
C. Take it easy.
D. Go ahead.
6.
A. Certainly.
B. Mind the steps .
C. Fine, thanks.
D. Well done.