"North America" joke

Teacher: John, why are you doing your math multiplication on the floor?
John: You told me to do it without using tables.
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Teacher: Glen, why do you always get so dirty?
Glen: Well, I'm a lot closer to the ground than you are.
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Teacher: Now, Simon, tell me frankly, do you say prayers before eating?
Simon: No sir, I don't have to, my Mom is a good cook.
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Teacher: Clyde, your composition on "My Dog" is exactly the same as your brother's. Did you copy his?
Clyde: No, teacher, it's the same dog.
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Teacher: Harold, what do you call a person who keeps on talking when people are no longer interested?
Harold: A teacher