There are a lot of disadvantages of living in a big city, and air pollution is among (1) _________ most serious problems. Rapid urbanization has led to a rise in the number of factories, as big cities attract both domestic and foreign investments (2) _________ the number of factories is increasing quickly. The air is heavily (3) _________ by smoke and emissions, which cause respiratory diseases and other health issues. Traffic congestion is another factor, as there are too many means of transportation (4) _________ makes this problem worse, and car exhaust further contaminates the atmosphere. Poor air quality affects everyone, especially children, the elderly, and those with pre-existing health problems. Dense population and limited green spaces worsen the situation, increasing urban heat and pollution-related risks. To conclude, air pollution, which is expected to (5) _________ more people get serious diseases such as lung cancer and tuberculosis, is a big drawback of city life.

Life in Vietnam has changed dramatically over the past few decades. In the past, most Vietnamese people lived in small villages and worked as farmers. They lived in simple houses made of wood and bamboo. Family members often lived together in one house, with three generations under the same roof. They usually woke up very early to work in the rice fields.

Transportation was basic - people mainly walked or used bicycles to get around. For entertainment, children played traditional games in the village square, while adults enjoyed folk music and traditional festivals. Most people cooked their meals using firewood, and they ate healthy food grown in their gardens.

Today, life in Vietnam is very different, especially in big cities like Hanoi and Ho Chi Minh City. Many people live in modern apartments and work in offices. Young people often prefer to live separately from their parents. Instead of bicycles, they ride motorbikes or drive cars. The streets are full of shopping centers, restaurants, and coffee shops.

Technology has changed daily life too. Most people have smartphones and computers. They can order food online and watch movies at home. However, some traditional values remain important. Vietnamese people still love family gatherings, traditional festivals, and their delicious traditional food.