Final answer:
When Sohrab realizes he cannot return to America with Amir, he focuses on his education and plans to go to a far-off country where he is not known.
Step-by-step explanation:
When Sohrab realizes that he cannot immediately return to America with Amir, he decides to study hard and learn Chinese works on astronomy. When Sohrab realizes he cannot return to America with Amir, he focuses on his education and plans to go to a far-off country where he is not known.
He also plans to go to a far-off country where he is not known to make his true power felt. This shows that Sohrab takes the action of focusing on his education and setting goals for his future.