Theory:

     He felt hunger pinching him and pressed his stomach with a grimace. “Hungry?” asked the girl. “You won’t get food by sitting here glumly, making faces. I can find some if you want.”
 
     She picked up her sack and started to walk away. Velu stayed on the bench. What should he do? Should he follow this girl? Where was she going to take him? She was disappearing into the crowd, so he had to make up his mind quickly. Alright, he decided. Anyway I have no idea where to go. He jumped up and ran after her. She wasn’t even looking back to see where he was.
Explanation:
 
Velu was hungry because he hadn't eaten anything except a few peanuts and jaggery for a long time. Velu was exhausted and had stomach pain as a result of his hunger. When the girl saw Velu's face, she realised he was hungry. The girl asked him to accompany her as no one will come to feed him if he sits here for a long period of time.
 
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Velu felt very hungry
 
Velu did not respond to the girl. So the girl took her bag, and she started walking. Velu remained seated on the bench, and he was thinking about where to go, whether he wants to follow her or where she will take him. Velu saw the girl was quickly disappearing into the large crowd. Velu had to make a decision soon because he only knew the girl in the vast city, and no one else could provide company for him. Velu needed to make a move before she vanished into the crowd. Finally, Velu decided to go along with the girl.

Immediately, Velu jumped up from the bench and ran behind her. But the girl was not at all turning back to see whether Velu was following him or not.
 
Meanings of the difficult words:
 
S.No
Words
Meanings
1
GlumlyLooking or feeling dejected
2
DisappearingBe lost or missing; become impossible to find
3
GrimaceAn ugly, twisted expression on a person's face, typically expressing disgust, pain, or wry amusement
4
HungerA feeling of discomfort or weakness caused by lack of food, coupled with the desire to eat
5
Prolonged timeContinuing for a notably long time
Reference:
National Council of Educational Research and Training (2008). It so happened. Children at work- Gita Wolf, Anushka Ravishankar and Orijit Sen (pp. 7-16). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.