---We can use MSN to communicate with each other online．

---Good!Will you please show me ______ it?

1. A.
   what to use
2. B.
   how to use
3. C.
   when to use
4. D.
   where to use

--We can use MSN to chat on line．

--Good! Will you please show me           it?

A．what to use          B．how to use          C．when to use         D．where to use

----We can use MSN to communicate with each other online.

----Good! Will you please show me 　　　　it?

　 A. what to use　　　　 B. how to use　　 C. when to use　　　　　 D. where to use