名词单复数与动词时态辨析 — 英语词汇题

听写填空：请根据所听录音（读两遍）补全句子，注意名词单复数与动词时态的正确形式。录音原句为：By the time the rescuers arrived, the flood ______ (destroy) dozens of ______ (house) in the valley, and the villagers ______ (already move) to safer places.