`25.` B

`-` Hầu hết đoạn văn nói về những bất lợi của cuộc sống ở thành phố:

`+` They say that compared to suburban areas, city life has many drawbacks.

`+` The high cost of living is the first disadvantage...

`+` Lack of space is another drawback of city life...

`26.` A

`-` Dẫn chứng: Apart from that, city people seem to suffer from more noise and air pollution. The densely populated neighbourhoods, heavy traffic, and big construction sites make cities noisy and dusty. These are harmful to people's health, such as increasing their stress levels, disturbing their sleep and making them suffer from breathing problems.

`-` "Them" ở đây thay thế cho "city people"

`27.` B

`-` entertainment complexes: các khu giải trí `~~` centers: trung tâm

`28.` D

`-` Dẫn chứng: The cities's authorities are trying to overcome these problems. However, they still have a long way to go before they can reduce living costs and pollution, and increase green space to make all cities in the world more liveable places.