The key answer of exercise 2

a)

1. +
2. -
3. -
4. +
5. +
6. -
7. -
8. +
9. +
10. +
11. -
12. -

b)

1. It has clean, safe streets.
2. The public transport system is terrible.
3. There's a lot of traffic.
4. It has beautiful buildings.
5. The people are friendly and polite.
6. There's a lot of crime.
7. It's very polluted.
8. There are nice parks and green spaces.
9. It has good shopping and nightlife.
10. There are lots of things to see and do.
11. It's expensive to live there.
12. It's very crowded.