5. A: The houses in the country are......in the city. (old) B: Yes, that's right. The houses in the city are... (modern).

Ответ: 5. A: The houses in the country are older than in the city. (old) B: Yes, that's right. The houses in the city are more modern than (modern).

Объяснение: Снова сравнительная степень. 'Old' образует ее с помощью -er. 'Modern' - длинное прилагательное, поэтому используем 'more'. Добавляем 'than'.