Who are you waiting ________?

1. A.
   at
2. B.
   with
3. C.
   to
4. D.
   for

--- Who are you waiting ________ the bus station?

--- My uncle.

1. A.
   at
2. B.
   for
3. C.
   at for
4. D.
   for at

--Who are you waiting for?

--______ the man wounded in the left leg．

A．The doctor will operate on                   B．The nurse to be looked after

C．The doctor to operate on                    D．His brother got

Who are you waiting ________?

[　　]