读一读，用所给单词的正确形式填空
1. I am eleven years old. My brother is ________(five).
2. This is my book. It's ________(he) book and it's ________(she) bag.
3. I can read a book. He can ________(write) and ________(sing).
4. There are some pencils，some ________(book)and a ________(bag)on the desk.
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