I guess she wanted to get to the Lancelot's room sneaky using the key she has got. And she put on the socks as she wanted to look not so ladylike. But it's still not clear for me.
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.................thankssss
Answer:
Later in this scene, King Duncan pronounces Macbeth the new Thane of Cawdor and, in doing so, refers to him as "noble." It is clear, then, that Duncan views Macbeth's actions in very positive terms. He respects his military prowess, his courage, and his loyalty.
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