tiny computerized robots called nanobots ~와 쓰임이 다른하나는?

1. take care of the baby left in your room

2. skilled workers came here to fix the machines.

3. i know the girl singing on the stage.

4. do you remember the boy playing with his dog?

5. look for the sleeping car.

답이 5번인데 왜 나머지는 쓰임이 같은건지, 왜5번만 쓰임이 다른건지 모르겠어요ㅠㅠ