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Give detailed answers: 1) Why do viewers expect actors to know their roles by heart? 2) What role should an actor have played in a very successful play? 3) Why do you think the actor always insisted that the letter that the jailer handed him be written out in full? 4) What copy of the letter did the prisoner receive once? 5) Why did the actor squint when he began to read the letter, which in fact was a blank sheet of paper? 6) Why should the jailer bring a pair of glasses and a regular copy of the letter to the stage? 7) What do you think next?