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这是你的家庭作业吧，同学。 1. I __am___ a boy. ___Are___ you a boy? No, I _am____ not. 2. The girl____is__ Jack's sister. 3. The dog ___is____ tall and fat. 4. The man with big eyes ____is___ a teacher. 5. ____Is__ your brother in the classroom?