New ways have to be found to _______ of waste materials and poisonous gases so17/50Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. New ways have to be found to _______ of waste materials and poisonous gases so that we can have cleaner surroundings.dealremovedodisposeGiải thíchĐáp án D Dispose of sb/sth: giải quyết vấn đề gì