Apart from(tour) and business, london is known for being the united kingdom's(politics) heart. it is also home to one of the country's most important(reside), the queen. although london is a big city, it would be (correct) to say that it's an unhealthy place to live, since attemps to reduce (pollute) levels have been quite successful. с грамматикой слова в скобках нужно грамматически изменить
Politician
Residential
Correctly
Pollution