---Hey, look where are you going?

--- Oh, I’m terribly sorry. _______.

A. I am not noticing                    B. I wasn’t noticing      

C. I haven’t noticed                  D. I don’t notice

---Hey, look where are you going?

--- Oh, I’m terribly sorry. _______.

A. I am not noticing                                          B. I wasn’t noticing             

C. I haven’t noticed                                                 D. I don’t notice

—Hey, look where you are going!

—Oh, ________ .

A. I'm terribly sorry

B. I am not noticing

C. that's all right

D. I don't mean to do it

—Oh, ________ .

A. I'm terribly sorry

B. I am not noticing

C. that's all right

D. I don't mean to do it