Read the following sign or notice and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

What does the sign say?

Đáp án chính xác: This door must remain closed to prevent the spread of fire.

Học sinh quan sát hình ảnh/ngữ cảnh và chọn đáp án đúng: This door must remain closed to prevent the spread of fire..