answer: #Person1# and #Person2# talk about Tom's change over time.
documents: #Person1#: Tom has grown six inches within a year. 
  #Person2#: He has reached puberty. His mind and body both will change a lot. 
  #Person1#: Yeah, do you see his Adam's apple? It becomes bigger. 
  #Person2#: Time is flying. I still remember everything when he was a child.