—May I speak to Tom?
—Sorry, he isn’t in now. What’s up?
—＿＿＿.
—Sure, go ahead.
A.  May I take a message for him?
B.  May I leave a message?
C.  Hold on, please.

---May I speak to Tom?
---Sorry, he isn’t in now. What’s up?
---______.
---Sure, go ahead.

1. A.
   May I take a message for him?
2. B.
   May I leave a message?
3. C.
   Hold on, please

---Could I speak to Tom? 
---Speaking.  ______?

1. A.
   Who is this
2. B.
   Who is that
3. C.
   Who are you
4. D.
   Who is Tom