Chen Kai is a Chinese boy. He is a student. He is 13 years old. He lives in Guangzhou. Chen Kai likes _ . Now he receives  a letter from Sam, his pen pal in America. The letter is in English. Sam is 14 and he is a student, too. He speaks English very well. In the letter, Sam says he wants to visit China and study some Chinese. ,. Sam is Chen Kai's   _  .
classmate pen pal brother teacher