Good morning, ladies and gentlemen. Here's the morning news. Yesterday afternoon a ten-year-old school boy swallowed   a pen cap! The boy was daydreaming in class. Without knowing what he was doing, he put a pen cap into his mouth. A few minutes later, he was terrified to find that he had swallowed it! The teacher was shocked when the boy stood up and said, "I've just swallowed a pen cap." He was quickly sent to the nearest hospital. There a doctor examined him and said the best treatment was to give him medicine so that the pen cap could pass naturally. Three hours later the boy successfully _  "The boy is really lucky," said the doctor. "It's not rare that small children put things into their mouths for fun. It's very dangerous."  He added. Which sentence is RIGHT according to the news?
The boy was 8 years old. The boy was listening carefully in class. The boy went to the hospital himself. The boy was all right at last.