Answer
Some of the answers are in the wordbank,
Step-by-step explanation
1. it'd be trout because as it says above, whenever we have more than one trout, we don't change the letters.
2. Now you could say Fishes for this answer, but i think the answer they're looking for is also fish, because to me it feels weird to say 'these fishes told Lisa a story'
3. Now, plural for hero is heroes. if it was two female heroes we'd say heroines but since it isn't specified it's better to go with heroes.
4. In the wordbank it says the plural for woman is women, so you'd write women.
5. Men is the plural for man
6. Mice is plural for mouse
7. This one is simple, beliefs is plural for belief
8. wolves is plural for wolf
9. Oxen is plural for Ox
10. Calves is plural for Calf
11. Children is plural for child
12. feet is plural for foot
13. lives is plural for life
English can be hard sometimes ^^'