---How do you do?  ---

---How do you do?  ---

-How are you?

-________

1. A.
   I'm OK．
2. B.
   How do you do?
3. C.
   How are you?
4. D.
   Good morning．

-- How are you?

--        .

A．I'm fine, too．                                           B．I'm OK．

C．How are you?                                         D．How do you do?