Question

In the city houses are taller than in the country.
In the city bridges are longer than inthe country.
In the city steets are wider than in the country.
In the city rivers are dirty than in the country.
In the city country houses are smaller than in the city.
In the city country rivers are cleaner than in the city.
In the city country gardens are bigger than in the city/
Прилагательные правильно написаны?

Answer 1

має бути "more dirty" в третьому реченні 
або "dirtier"