Откройте скобки и поставьте прилагательные в сравнительную или превосходную степень:
A: So it is much better here than in London, then?
B: Well, I am not sure. The wrost thing about London was the pollution – and it is certainly (5)________ polluted here in the country. And I suppose it is (6)________ (stressful).
Спасибо

The wrost thing about London was the pollution – and it is certainly (5)__less__ polluted here in the country. And I suppose it is (6)__less_ stressful.