1.
this pie is smaller and cheaper than that big pie

2
. Ho Chi Minh city is more mordern than Hoi An 

3.
A house in the countryside is often cheaper than a house in the city

4.
It's usually quieter to live in the countryside than in the city

5.
Da Nang is cleaner than Hanoi

1. That big pie is bigger and more expensive than this pie. (small, cheap)

→ This pie is smaller and cheaper than that pie

2. Hoi An is more historic than Ho Chi Minh City. (modern)

→Ho Chi Minh is more modern than Hoi An

3. A house in the city is often more expensive than a house in the countryside. (cheap)

→A house in the countryside is often cheaper than a house in the city

4. It’s usually noisier to live in the city than in the countryside. (quiet)

→It's usually quieter to live in the countryside than in the city

5. Hanoi is more polluted than Da Nang. (clean)

→Da Nang is cleaner than Ha Noi