Theory:

     “What are you carrying in that bag?”

     “Things, bottles, paper.”

     Velu wondered what she was doing with them, but he felt shy to ask any more questions.
 
     It was still morning but the sun blasted down on the tar and Velu’s bare feet burned. It was not like walking on a mud road. He was soaked with sweat. He tried hard to walk in the shade and keep up with the girl at the same time. She walked really fast. How far away was the food?
Explanation:
 
Velu asked the girl, “What are you carrying in that bag?” She told him she was carrying things, bottles, and paper. Velu was amazed because he did not know what she was doing with that. He felt shy to ask her more questions. Both of them were walking for a long time. Even though it was morning, the sun blasted its strong rays. Due to the sun's hot rays, one faces very difficulty in walking on the road with bare feet. But here in Chennai city, even the morning rays are equal to the afternoon sun rays.

Velu was walking with his barefoot. The sunrays hit the tar road, and it hurt him while walking. His feet got burned because of the morning sun. Velu thought that it was not as easy as walking on a mud road. Velu used to walk on the mud road with his bare feet in his village, and it would not hurt him. After walking for a long time, he felt exhausted, and he was soaked with sweat.
 
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Velu soaked with sweat
 
Velu tried to walk in the shady area; it would give him some relief. But the girl was walking even faster on the hot road. Velu tried to walk along with the girl. Velu thought about how long he had to walk on the street to get the food.
 
Meanings of the difficult words:
 
S.No
Words
Meanings
1
Sun blastedThe hot rays of the sun hitting over some objects or things
2
SoakedExtremely wet; saturated
3
SweatMoisture exuded through the pores of the skin, typically in profuse quantities as a reaction to heat, physical exertion, fever, or fear
4
ReliefA feeling of reassurance and relaxation following release from anxiety or distress
5
TarA dark, thick flammable liquid distilled from wood or coal used for road-making and for coating and preserving timber
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.