Mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the following questions. 

 According to the survey, a greater number of residents than ever before  ____________  in the city's recycling program.

Suy nghĩ và trả lời câu hỏi trước khi xem đáp án

ATNETWORK
ADMICRO
YOMEDIA
ZUNIA9