The key answer of exercise 1

a)

• deserted → empty and quiet because there are no people there
• abandoned → left by the people who owned or used it
• uninhabited → not lived in
• rehabilitation → the process of helping someone to live in a healthy, active way again
• quarantine → keeping a person or animal apart from others for a time in case they are infected with a disease

b)

1. -
2. Maybe there is nowhere for people to work, so they move away. Perhaps a building is deteriorating and needs repair but there is no money. Perhaps an area is no longer desirable to live in.
3. People who have been ill, broken a bone or had surgery may need rehabilitation. Addicts or prisoners also need rehabilitation.
4. Infectious diseases (like the plague, cholera, tuberculosis, diphtheria, etc.) require quarantine.