Theory:

     KARI, the elephant, was five months old when he was given to me to take care of. I was nine years old and I could reach his back if I stood on tiptoe. He seemed to remain that high for nearly two years. We grew together; that is probably why I never found out just how tall he was. He lived in a pavilion, under a thatched roof which rested on thick tree stumps so that it could not fall in when Kari bumped against the poles as he moved about.
Explanation:
 
The main characters of the story "Bringing up Kari" are Kari and the narrator. Kari was just a five-month-old baby elephant when he reached the narrator. The narrator was not only the caretaker but also his best friend. He treated Kari like a baby.
 
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Kari and the narrator
 
When he was a little boy, he could reach Kari's back if he stood on tiptoe.
 
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Narrator stood on tiptoe
 
Both of them grew together, and the narrator probably didn't know how tall Kari was. He lived in a pavilion under a thatched roof; it rested on thick stumps so that it would not fall when Kari tried to move around.
 
Meanings of the difficult words:
 
S.No
 Words
Meanings
1
Pavilion
Shelter; relaxation spot
2
Tiptoe
To walk on your toes with your heels off the ground
3
Thatched
Materials such as leaves or straw used to cover a roof
Reference:
National Council of Educational Research and Training (2007). Bringing up Kari- Dhan Gopal Mukherji(7-14). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.