How long have you been living in Ha Noi/Hai Phong/etc...?
=> i have been living in HN for 20 years
Are there many people living in your city/ town?
=> there are many people living in my city
What problems can overpopulation cause?
=> overpopulation can lead to unemployment, lack of housing, lack of food, insufficient facilities, etc
Do you like to live in a place with many people? Why? Why not?
=> sometimes i want to live in a quiet place because i want to try peaceful atmostphere and fresh air because the air in city which has many people is very polluted