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寫出下列句子的復(fù)數(shù)形式。
1. This is a book.
   _________________________
2. That is my parent.
   _________________________
3. Yes, it is.
   _________________________
4. What's this?
    _________________________
5. Is that your pencil?
   _________________________
1. These are books  
2. Those are my parents
3. Yes, they are
4. What are these
5. Are those your pencils
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