Can you point out which words aren't natural and correct in my sentences? Kuihua noticed that her brother, Qingtong, always liked to sit beside her and focus his eyes on her writing and calculating when she was doing homework. His eyes were
filled with envy and desire. That day, all of a sudden, she came up with an
idea: I want to teach my brother literacy! This idea was like a light
illuminating her heart, which surprised and thrilled her. She blamed herself, “Why didn't I think of it before”?