-How are you?

-________

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

?How do you do?

?________

A. How do you do?

B. How are you?

C. Good morning．

D. Hello．

How are you?

 ________

[　　]

A．How do you do?

B．Good morning.

C．I'm fine, thanks. And you?