根据短文内容,填写所缺单词或用所给单词的正确形式填空。
Once upon a time, a lion 1. (catch) a mouse. The mouse said, "Please don't eat me! I 2. (help) you one day." The lion laughed but let the mouse go. Later, some hunters caught the lion 3. a net. The lion could not get 4. . He felt very sad. Then, the little mouse came. He bit through the net with his sharp 5. (tooth). The lion 6. (be) free! He thanked the little mouse. 7. the mouse said, "You laughed at me before, 8. even a small mouse can help a big lion." This story 9. (teach) us that we should be kind to everyone, because even 10. (weak) ones can help the strongest sometimes.

1.caught 2.will help 3.in 4.out 5.teeth 6.was 7.Then 8.but 9.teaches 10.the weakest

1. 由时间状语Once upon a time（从前）可知时态为一般过去时，catch的过去式是不规则变化caught。
2. 此处是老鼠的直接引语，one day指代将来的某一天，表达“我总有一天会帮助你”，用一般将来时will help。
3. 固定搭配catch sb. in a net表示“用网困住/抓住某人”，填介词in。
4. 固定短语get out表示“逃脱、脱身”，这里指狮子没法从网里逃出来，填out。
5. 老鼠的尖牙不止一颗，可数名词tooth要使用复数形式teeth。
6. 故事发生在过去，主语the lion是单数，be动词的过去式用was。
7. 前文提到狮子向老鼠道谢，后文是老鼠开口说话，是顺承场景，填副词Then，意为“然后”，句首首字母大写。
8. 前后句存在转折含义：“你之前嘲笑我，但是就算是小老鼠也能帮到大狮子”，填转折连词but。
9. 此处表达客观道理，时态用一般现在时，主语This story是第三人称单数，谓语动词teach变为teaches。
10. 后文的the strongest是形容词最高级，对应此处要填weak的最高级the weakest，和“最强者”形成对应，表示“最弱小的”。