In China, the history of people planting and using bamboo can date back as far as 7000 years. As early as the Shang Dynasty, bamboo was being used in ancient peopled dally lives. It was used for food, clothing, housing, transportation,____ (music) instruments and even weapons.

    The ____(apply) of bamboo in science and technology is thrilling. In 251 BC, Li Bing, in Sichuan,____ (lead) the local people in building the Dujiang Weirs, the first irrigation network in the world, in which bamboo played ____important role. The world’s oldest water piper was also ____ (make) of bamboo. During the Han Dynasty, the people in Sichuan ____(success) sank a 1600-metre-deep well with thick bamboo ropes. This technology did not spread to Europe____the 19th century, and it was by using the technology ____ the Americans drilled the first oil well in Pennsylvania in 1859.

    In Chinese culture, bamboo is well-known as ____of the “four gentlemen” in plants. To many distinguished men，bamboo is a symbol of goodness and honesty. It is always closely related to people of positive spirits. Bamboo culture contributes to encouraging People to hold on when ____(face) tough situations.

小琪同学往右图所示的烧杯中加入一种固体物质，搅拌后，发现温度升高、石蜡熔化、塑料片掉了下来．该同学加入的物质可能是（　　）