A、A little shy but wise. B、Afraid to make mistakes. C、Very tall. D、Very short. A

He usually sat behind me in class but seldom talked. Perhaps he feared to make friends. His worry was not reasonable because he always spoke words of wisdom.
    One day, he was leaning against a tree alone in front of my dormitory. Could he be waiting for me? I looked directly at him but he didn’t notice. My heart beat fast. Was he waiting for someone else?
    It was Wednesday. The professor asked him to distribute our homework. He called out each English name of my classmates and returned the assignment. Then he came to my desk and held out my paper. He looked at me and when he said my name—my Chinese name—it sounded more beautiful than anyone else had ever pronounced it. For a time we took a firm hold of the paper. A force seemed to pass through the paper between us. That day he had a lot to say and so did I. All the world seemed sunny and magnificent.
    He hurriedly left the classroom when the bell rang. I hastened to follow him and at the door-way I froze. My notebook fell. He took my notebook and put it under his arm as he brushed my shoulder, pushing me slightly toward the outside door, "I know where you live. I will walk you home. "
Q:
16. What’ s the probable relationship between the boy and the author?
17. At the very start, what kind of person do you think the boy was?