IELTS Grammar: correct the mistakes

 Can you see the mistakes in the following topic sentences?

1. On the one hand, people facing different situation living in a city.
2. The problems that urban inhabitants may face with are high cost of living, many kinds of social problems as well as poor air quality.
3. People dwelling in cities are facing different kind of issues every day.
4. On the one hand, the denizen need to face the challenge life in urban sprawl.
5. The fantasy of high standard city life is infact faced with reality of many daily challenges.

Tip: the easiest way to improve these sentences is by simplifying them.