TODAY, Monday, Wanda Petronski was not in her seat. But nobody, not even Peggy and Madeline, the girls who started all the fun, noticed her absence. Usually Wanda sat in the seat next to the last seat in the last row in Room Thirteen. She sat in the corner of the room where the rough boys who did not make good marks sat, the corner of the room where there was most scuffling of feet, most roars of laughter when anything funny was said, and most mud and dirt on the floor.
 
     Wanda did not sit there because she was rough and noisy. On the contrary, she was very quiet and rarely said anything at all. And nobody had ever heard her laugh out loud. Sometimes she twisted her mouth into a crooked sort of smile, but that was all.
Explanation:
 
The lesson "The Hundred Dresses I" is written by Eleanor Estes. The protagonist of the story is Wanda Petronski, a polish girl who studies in an American school. The lesson narrates how the American girls treated a polish girl.

The story opens in a classroom on Monday. On that day, Wanda Petronski was not in her seat. But her absence was not even noticed by anybody. Even Peggy and Madeline have not noticed her absence. These are the girls who started all the fun in the classroom (The fun is revealed later in the story).
 
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A classroom

Wanda usually occupied her seat next to the last seat in the last row in Room Thirteen. She sat in the room's corner where the rough boys usually sat. Here, rough boys, in a sense, used to refer to the boys who used to make noises and play during class hours. Also, they didn't get good grades in their exams. In addition, one can hear the loudest laugh in the room's last area. The boys would make laughing when anything amusing was spoken. Also, the sound of feet shuffling was heard in between. Moreover, while looking at the floors it was covered with mud and dirt. The muds and dirt were from their shoes or sandals.

The narrator said that Wanda used to sit there as she was not a rugged and noisy person. While looking at the previous paragraph, one can find that the rough and loud people used to sit on the last bench. When it comes to Wanda, she was not sitting there because of roughness. On the contrary, the narrator said that she was a calm person. She used to speak rarely to others. Even nobody in the classroom heard her loud laugh. When someone said anything to her, she would smile unevenly. It means that she wouldn't smile pleasantly. She used to smile gloomily by twisting her mouth.
 
Meanings of the difficult words:
 
S.NoWords
Meanings
1
Corner A place or angle where two sides or edges meet
2
Rough Of a person whose behaviour is not gentle or violent
3
Quiet Making little or no noise
4
Laughter The action or sound of laughing
5
ContraryOpposite in nature, direction, or meaning
6
Twisted Forced out of its natural or proper shape; crumpled
7
Mud Soft, sticky matter resulting from the mixing of earth and water
8
Dirt A substance, such as mud or dust, that soils someone or something
9
FloorThe lower surface of a room, on which one may walk
Reference:
National Council of Educational Research and Training (2007). The Hundred Dresses I - Eleanor Estes (pp. 63 - 72). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.