2. A block of flats is taller than villa. A block of flats isn't as tall as villa.
3. The city centre is more noisy than suburbs. The city centre isn't as noisy as suburbs.
4. A cottage is smaller than bungalow. A cottage isn't as small as bungalow.
5. Houses are more expensive than flats. Houses aren't as expensive as flats.
6. Cities are more crowded than villages. Cities aren't as crowded as villages.
7. The suburbs are more beautiful than city centre. The suburbs aren't as beautiful as city centre.