3) My brother's laptop is better than my laptop.
4) The black armchair is the least comfortable armchair in the living room.
5) The kitchen is the busiest room in our house.
6) Evan's hobby is more/less interesting than Pete's.
7) The lamp is not the most expensive thing in my room.
8) Sally is the nicest girl I know.
9) My top score in this game is better than yours.