Помогите решить пожалуйста номера 4,5,6,7,8

4) the most expensive
nicer
best
the cheapest
the worst
most boring 
least exciting

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

6) 3. Gamma is the fastest. 
4. Beta is slower than Gamma. 
5. Alpha isn't expensive. 
6. Alpha is the heaviest. 
7. Gamma isn't heavy.