用一般过去时叙述故事 — 英语填空题

用括号中动词的正确形式填空，完成故事。One evening, Mia ___ (walk) home through the woods. Suddenly, she ___ (see) a small silver key beside a tree. She ___ (pick) it up, but she ___ (not open) the little box nearby because she heard someone calling. She ___ (return) the key to an old woman, who thanked her.