--- We can use QQ to communicate with each other online.
--- Good. Will you please show me _______?

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

--- Good. Will you please show me _______?

A．which to use       B．what to use        C．where to use it     D．how to use it

 —We can use QQ to communicate with each other online.

   —Good. Will you please show me         ?

A. which to use         B. how to use it   

C. what to use          D. where to use it

--- We can use QQ to communicate with each other online.
--- Good. Will you please show me _______?

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

—We can use QQ to communicate with each other online.
—Good. Will you please show me         ?

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