I do not have eyes but I once could see. I used to have thoughts but now I’m empty. What am I?

Answer: Skull

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I don’t speak but there is no word I cannot make. What am I?
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I eat, I live. I breathe, I live. I drink, I die. What am I?
I enclose you in darkness but allow you to see many things. If you resist me, you're likely to get rings. What am I?
I encourage people to run home and steal. What am I?
I end and begin the day, Without me, you’ll pay. With the aid of sheep, All my benefits you shall reap. If I make you miss class, You shall not pass! What am I?