(21)天完全黑了下来，程海跑遍了工区大道和附近的宿舍，没有找到那个收旧货的，也没有看见那个吸烟的男孩。

(21) It was completely dark. Cheng Hai ran across the main road of the work area and the nearby dormitories. [But] he couldn’t find the junk collector, nor did he see the boy with the cigarettes.