阅读下面材料,在空白处填入适当内容(1个单词)或括号内单词的正确形势。
Eye doctors in Shanghai found 1________recently that the nearsightedness(近视) among primary and middle school students has 2________to do with the color of the paper in their textbooks and notebooks.
The doctors suggested that yellow paper should be used to replace the white one. According to their research the experts discovered that white paper reflects too much light and 3 ________ (easy) tires a person's eyes. Yellow paper, 4______, doesn't look so sharp to a person's eyes. In other words, it is 5________ milder to the eyes of students 6________may do reading or writing for hours.
The expert's research finding was based on first-hand information and 7 number of scientific experiments 8________ (include) a recent study among the students from forty-one middle schools. 9________ (make) the students understand the truth, Shanghai Education Development Co. Ltd has produced textbooks and exercise-books made of yellow paper. The books will 10 ________(use) in the whole city soon.