Answer:
What gets whiter the dirtier it gets?
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I run around the streets all day. Under the bed or by the door I sit at night, never alone. My tongue hangs out, waiting to be fed during the day. What am I?
I must be broken before you can use me.
What kind of tree can you carry in your hand?
Give it food and it will live, give it water and it will die.