Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs  from the rest in the position of the main stress in each of the following questions.
Câu 1: 
         
         A. category            
         
         B. accompany
         
         C. experience
         
         D. compulsory
Câu 2: 
         
         A. attract            
         
         B. verbal
         
         C. signal
         
         D. social
A.
B.
C.
D.