听短文，根据所听内容和思维导图补全短文。

In an English class, our teacher asked one interesting question: "What is the most important in history?" Soon we had a group  and it was time to share our ideas. Many classmates raised their hands and shared their opinions. Tom thought the  are the most important inventions because they gave out light for us to work at night. Jack's ideas are the . In his opinion, computers could make us work more efficiently and also make our life more convenient. Finally it was Simon's turn and he thought  were the most important ones. He said people nowadays could easily contact with each other anytime anywhere. We learned much about different inventions in this class. What a lively class!