请先阅读下面短文，掌握其大意，然后用方框所给的词的适当形式填空，每个词限用一次。

    It was a fine day in autumn. Some girls and boys were out ____ their teacher. They ____ to a museum. On their way to cross a bridge, they suddenly(突然地) heard a loud shout behind ____. The teacher told her pupils____ . Then she turned and listened. When she heard the cry“Mad dog!”she knew what was happening. ____ she could do anything, she saw a dog running to them.“____”said the teacher, “keep close to each other. Don't move or cry.” Then she stood before the children so that the dog would meet her first. The animal came quickly.

    At this moment the teacher saw a man. He ran up with a gun(枪) in his ____. “The children must be kept safe ____ the man comes.” Thought the lady. The teacher ran to the dog, facing it bravely. The mad dog snapped(猛咬) at her and she fell down. The man came and killed the animal. The dog had bitten her so ____ that the brave lady died soon after the doctors arrived. She lost her life for her ____. When people heard of this, they said, “The brave lady will always be remembered among us!”

浙江省青田县山峦起伏，林木茂密：当地农户引山泉水自上而下自流灌溉稻田，春季插秧时将鱼苗放入田间，使田鱼与水稻共同生长，形成稻鱼共生系统，至今已有1200多年的历史2（均5年4月被联合国教科文组织评为全球首批重要农业文化遗产。下图示意田鱼共生系统食物链关系。