I think they behave like this because they feel lonely during the class and wants attention. to overcome this problem the teacher should not scold them but make them feel good by making them do certain work like bringing something from any other class or make them read any chapter loudly so that they are engaged in some task and do not disturb others.

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ohh very nice advice !!!
Thanx a ton !!!
can u help me in a question of physics?
Yes of course but what is it??
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If they are doing so first make them try to understand that it's not right and they should not disturb everyone in the class. This children do like this because they don't have any interest in studying and they don't want to let other children study.You can also keep a cupboard where you can store the books. If the situation worsens then complain to the class teacher about your classmates that they are very irregular and always disturb everyone. Let them get punishment from the teacher then they may realize their mistake. 
thanks ...this was what I was looking for
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