根据上下文内容，填入适当的单词。（每空一词）。
I am from the USA . My name is Helen . I am Liu Tao’s penfriend . Liu Tao is twelve years old . I’m as old as him . There are four people in my family . My father is a doctor . My mother teaches English in a primary school . My brother Jack is only four years old . He is lovely . We all love him very much .
Liu Tao _________ a penfriend .________ name is Helen . She’s an __________ girl .There are ________ people in her family . Her father works in the ___________, and her mother is a _________ .
