阅读短文，用适当词填空

Hello, everyone!

       My name   1   Jack Smith. Jack is my   2   name. Smith is my last name.This   3   my father, Tom

Smith. He is forty-five years   4  .My mother's   5   isLucy Brown. She is forty-one years old.I love them

very much.

凡有温差的物体就一定有热量的传递。