Teaching landings? Don't take off!
Before taxiing onto the runway, in a tricycle gear airplane set the flaps to match the downward aileron deflection (usually what ever the short field setting if flaps are recommended) Next, set the elevator trim to where it would normally be for landing. Taxi onto the runway with full aft elevator (like a soft-field take off) Line up on the center line then apply just enough power to get the nose wheel off the ground. During the high speed taxi, maintain centerline using the rudder and maintain the attitude with elevator and power adjustments. Keep the main's on and just wheelie down the runway.
This exercise accomplishes many things at once. 1)Direction control with the rudder 2)How to maintain a landing attitude as airspeed diminishes 3)Sight picture of the landing attitude 4)Using peripheral vision to maintain centerline 5)Hand-Foot-Eye coordination 6)More smooth and precise elevator & power inputs. Finally, it teaches and eventually eliminates the tendency to land flat and porpoise by emphasizing positive elevator control from touchdown to roll out.
This exercise should be briefed and demonstrated before expecting the student to do it on their own.