Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
School uniform is compulsory in most of Vietnamese school.
A. depended
B. optional
C. obligatory
D. required
Đáp án B
A. phụ thuộc
B. tùy chọn
C. bắt buộc
D. bắt buộc