The passage told us that a student, Sam was sent to a boarding school, in which he very missed his parents, so he got sick and could not focus his attention on his lessons.
In fact, in real life, everyone can have an experience of feeling homesick. I remember when I was 10 years old, because my parents was busy, I was sent to my uncle’s in another city. Here, I studied for two years. Although my aucle and his family were kind to me, I still felt homesick. At first, I couldn’t sleep well, because I didn’t adapt to the climate there. And, because different teachers have different teaching methods, it was difficult for me to understand the lesson. Besides, I was new for the students there, I hardly had friends. I felt very lonely.
As days went on, I slowly adapted to the new environment. I actively communicated with my new students and made friends with them. My homesick gradually disappeared.