Theory:

     Monday morning found Tom Sawyer miserable. Monday morning always found him so because it began another week’s slow suffering in school. He generally began that day with wishing he had had no holiday in between, it made the going into prison again so much worse.

     Tom lay thinking. Presently it occurred to him that he wished he was sick; then he could stay home from school. He examined himself. No sickness was found, and he investigated again. This time he could detect stomach ache, but it soon grew feeble, and presently died wholly away. He reflected further. Suddenly he discovered something. One of his upper front teeth was loose. This was lucky; he was about to begin to groan, as a “starter,” as he called it, when it occurred to him that if he came into court with that argument, his aunt would pull it out, and that would hurt. So he thought he would hold the tooth in reserve for the present, and seek further.
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Explanation:
 
It was Monday morning, Tom Sawyer, a student, did not feel comfortable. He was always like this on all the Monday mornings. The problem was he didn't like going to school. He always desired that there shouldn't be any holidays in between the week or he has to gain again the courage to go to the school, which is like a prison for him.
 
Tom was on his bed, and he did not get up yet for the school. He was trying to think if he had any physical problems or ailments so that he need not go to school. He looked at himself if he had any ailments like stomach ache, toothache, etc. But his stomach ache was not much, and after some time he did not feel stomach ache at all. But, one of his upper front teeth was hurting him. If he said that to his aunt, she would pull it out. So, he did not complain about that and kept it for future drama.
 
Meanings of difficult words:
 
Numbers
Word
Meanings
1.
Miserable
Uncomfortable.
2.
Prison
A building in which people are legally held as a punishment for a crime.
3.
Examined Inspect.
Reference:
State Council of Educational Research and Training (2018). Term-1 English Standard-7. On Monday morning - Adapted from The Adventures of Tom Sawyer by Mark Twain (pp. 18-21). Published by the Tamil Nadu Textbook and Educational Services Corporation.