Based on the text provided, here are the corrected answers to the questions:

1. According to the passage, some good things in the city are:
- **b. excellent educational system and countless job opportunities**

2. While big cities have more job opportunities, they also give:
- **d. greater chances of being unemployed**

3. What does the phrase "cost an arm and a leg" mean?
- **c. cost a lot of money**

4. According to the paragraph, city is not a perfect place for:
- **you must work hard to earn money**

Feel free to ask if you have more questions!