阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Willis Carrier 【小题1】 (design) the first air-conditioning unit in 1902, just a year after 【小题2】 (earn) his master's degree in engineering from Cornell University. At a Brooklyn printing plant, changes in heat and humidity (湿度) were causing the size of the printing paper to keep changing slightly, making 【小题3】 hard to arrange different colours. With Carrier's invention, temperature and humidity levels could 【小题4】 (control), so the problem was solved. The invention also allowed industries such as those of film, processed food, and textiles 【小题5】 (improve) the quality of their products.
In 1914, the first air conditioner was put in a private house. However, it took up too much space, and later models cost too much for most people. Cooling for human comfort, rather than industrial needs, 【小题6】 (actual) took off when three air conditioners were set up in the J.L. Hudson Department Store in Detroit, Michigan. People crowded into the shop to experience the new invention. The fashion spread from department stores to cinemas, whose income rose steeply (急剧地) as a result 【小题7】 the comfort they provided. According to research 【小题8】 (conduct) in the 1950s, air conditioning increased productivity amongst 【小题9】 (employee).
Jed Brown, 【小题10】 is an environmentalist, complains that air conditioning is a cause of global warming. However, he has to admit that it provides a healthier environment for many people in the heat of summer.
