Chia dạng đúng của từ trong ngoặc

5 . The red shirt is better but it's ( expensive ) ............... than the white one .      
6 . I'll try to finish the job ( quick ) .............................        
7 . Being a firefihghter is ( dangerous ) ....................... than being a builder .
8 . Lan sings ( sweet ) ..................... than Hoa . 
các bn help với !