Привет как проверить в слове всезнайки и

7.My cousin asked when I was coming to see them.8.She said she liked the poem and added that she was going to learn it by heart.9.She asked not to be late for dinner.10. Our teacher said that we had to work more systematically.11. They asked not to stay there any longer and explained that it was getting dark.12. The girl said that they had a lot of English books at home.13. The child asked me what I was doing.14. The mother asked why I was crying and told me to come up to her.15. The boys told father that they wanted to help him.16. Mr. Smith suggested to have dinner with them.17. The mother told children to eat up their porridge.18. The teacher asked Mike to find the Thames on the map.19. They asked John not to make so much noise and explained him the baby was asleep. 

Можно проверить по падежу. Всезнайки- родительный падеж, 1 склонение, женский род. Поэтому пишем и

Здесь только одна буква и и она в конце, гласные в конце не проверяются.