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How and Why We Sleep? It's apparent that everyone needs to sleep.However,most people vary think about how and why they sleep.We know that if we sleep well,we felt rested.If we don't sleep enough,we often felt tired and irritable.It seems there are tw
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A: Did you take the written test? B: I haven't taken it yet. A: Make sure to study first. B: I study every night. A: I'm sure you're ready. B: Does it cost money? A: No, it doesn't cost anything. B: Does the test cover everything in the manual? A: It
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