19. 밑줄 친 He[he]가 가리키는 대상이 나머지 넷과 다른 것은?
It was a beautiful Friday afternoon and the weekend was about to begin, but Rob had a lot on his mind. 1) He had been putting off doing his chemistry report which was due on Monday. After borrowing some books from the library, he went home. Later that evening, 2) he was donig the assignment when his father came in. "What are you doing, kid?" he asked. "Biography of Marie Curie," Rob said absently as 3) he was typing on his computer. "Really? I did that for a chemistry assighnment when I was in school," his father said. "Why don't you find some information from the encyclopedia over there?" 4) he added. Rob grabbed the encyclopedia. He smiled thinking that even though he was practically born playing computer games, 5) he was still doing the same assignments his father did over 20 years ago.(140 words)