Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. 39. The students will provide aids for the homeless people tomorrow. A. Aids will be provided for the students and the homeless people tomorrow. B. Aids for the homeless people will be provided by the students tomorrow. C. Aids for the homeless people will provided by the students tomorrow. D. Aids for the homeless people will be providing by the students tomorrow 40. There are many factors contributing to air pollution. A. Air pollution results in many consequences. B. Air pollution is contributing to these phenomena. C. Air pollution is the result of burning forests. D. Factors contributing to air pollution are numerous. Giải thích tại sao