5 . 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。
A skywell, or “tian jing” (天井) in Mandarin, is a typical feature of a 1 (tradition) home in southern and eastern China. Different from a northern Chinese courtyard, a skywell is 2 (small) and less exposed to the outdoor environment.
Skywells are 3 (common) seen in homes dating to Ming and Qing dynasties, which housed different 4 (generate) of relatives. Skywells helped cool buildings in 5 era well before air-conditioning existed. When wind blows above a skywell house, it can enter the indoor space through the opening. 6 outdoor air is often cooler than indoor air, the incoming breeze travels down the walls to the lower stories and creates airflows by replacing warmer indoor air, 7 rises and leaves through the opening.
8 (design) to serve as a gathering space for families or communities as well, skywell buildings 9 (exist) in China for hundreds of years. Although in recent times they have often been forgotten by people 10 (prefer) modern facilities, due to a revival of traditional Chinese architecture, skywell buildings have been making a comeback.
