Відповіді: Стр.148 (2)

If the cities had more trees/green areas, pepple would have more oxygen.

If the authorities improved public transport, people wouldn’t buy so many cars.

If people used bicycles, the cities would be less polluted.

If people recycled things, there wouldn’t be so much rubbish everywhere.

If the authorities created more parks, the children could be able to play safety.