The dog's bed _____________ (less/more comfortable) than the cat's bed.
The dog's bed more comfortable than the cat's bed.
My car is ___________ (less/the least) expensive of all the cars.
My car is the least expensive of all the cars.
My cellphone is ___________ (the most modern / more modern) of all the cellphones.
My cellphone is the most modern of all the cellphones.