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It depends on the level of class that which activity can be geled up with the topic.
Inbetween you can say them let's play ,
say them to get up & sit down , or move your left hand up /right hand up etc , change the paatern suddenly.
Basic motto is to instantly change their mind set .
Let them answer more about the topic, even if they are wrong let them complete their point of view.
Gradually introduce them to correct concept