Choose the word that has stress pattern different from that of the other words.
Câu 1: 
         
         A. volunteer            
         
         B. nation
         
         C. college
         
         D. hospital
Câu 2: 
         
         A. orphanage            
         
         B. participate
         
         C. vacation
         
         D. remote
Câu 3: 
         
         A. comfort            
         
         B. area
         
         C. happiness
         
         D. believe
A.
B.
C.
D.