找出下列句子中唯一的错误，并改正在后面的横线上。
1. I love my parent very much. They love me, too.  _____________________
2. What are they? It's balls.  _____________________
3. Five and three are eight.  _____________________
4. this is my pencil-case.  _____________________
5. This is my brother. Her name is Tom.  _____________________

【考点】指示代词,复数名词,人称代词,物主代词,系动词

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