Name one thing you would change in your city and explain why.

Describe the current situation with concrete facts, then the consequences, then propose a solution.

Patterns: «Đây là một vấn đề...», «Chúng ta cần...», «Sẽ tốt hơn nếu...».

Avoid generalities. One concrete example from your own street is more convincing than ten broad statements about the whole country.