改错，下列句子均有一处错误，找出来，将正确的句子写在横线上。1. It's a old, old story.
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2. There are two pair of skates.
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3. Danny walk to school every day.
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4. These are my boot.
_________________________________________________________1. It's an old, old story.
2. There are two pairs of skates.
3. Danny walks to school every day.
4. These are my boots.