Answer:
The more you take, the more you leave behind. What are they?
Tuesday, Sam and Peter went to a restaurant. After eating lunch, they paid the bill. Sam and Peter did not pay. Who did?
When it comes to me, you go on red and stop on green. What am I?
I am the building with the most number of stories. What am I?
Use me to reward good behavior.
No matter how little or how much you use me, you change me every month.