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Here are the answers: 6. It is very important to know about Viet Nam's role in Asia. 7. My teacher's hobby is reading books. 8. She hasn't seen her parents. **3.1 Causes of Global Warming** Global warming is a serious issue affecting the world today. One of the main causes of global warming is the increasing levels of greenhouse gases in the atmosphere, such as carbon dioxide and methane. These gases are released through human activities like burning fossil fuels, deforestation, and industrial processes. As a result, the Earth's average temperature is rising, leading to severe consequences like melting of polar ice caps, sea-level rise, and extreme weather events. Furthermore, the destruction of natural habitats and loss of biodiversity also contribute to global warming. It is essential for individuals, organizations, and governments to take immediate action to reduce their carbon footprint and mitigate the effects of global warming. **3.2 Advantages/Disadvantages of Living in a Smart City** Living in a smart city has both advantages and disadvantages. On the one hand, smart cities offer numerous benefits, including improved public services, enhanced safety and security, and better transportation systems. For instance, smart traffic management systems can reduce congestion and commute times, while smart energy grids can optimize energy consumption. On the other hand, living in a smart city also has its drawbacks. One of the main concerns is the potential loss of personal privacy, as smart cities rely heavily on data collection and surveillance. Additionally, the high cost of living in a smart city can be a barrier for low-income residents. Nevertheless, the advantages of living in a smart city often outweigh the disadvantages, making it an attractive option for many people.