【推荐1】The sale of saltpeter(硝酸盐)to foreigners was banned in 1076. Nonetheless, knowledge of the miraculous substance was carried along the Silk Road to India, the Middle East, and Europe. In 1267,_______ European writer made reference to gunpowder, and in 1280 the first recipes for the explosive mixture were published in the west. China’s secret was out. (用适当的词填空)

【推荐3】One of my roommates in college worked as ________ editor in the publishing house next to my apartment but we never came across each other. (用适当的词填空)