A．They are made of better materials． 
B．They are made of expensive materials． 
C．They are made by the workers with a proper wage． 
D．They are made by the workers with a high education． 

A．One should be wealthy enough． 
B．One should buy cheap things． 
C．One should buy everything second-hand． 
D．One should buy less． 

A．Those are cheap． 
B．Those are ethical． 
C．Those are unique． 
D．Those are comfortable．