用动词be (am,  is,  are)填空。 1. She _____ a teacher. Her name _____ Mary. 2. I _____ a boy. My name _____ Li Ming. 3. Who _____ this girl? She _____ Li Mei. 4. How old ______you? I _____ eleven. 5. What _____ this? It _____ a bird. Its name _____ Polly. 6. David _____ a student. His sister _____ a student, too. 7. These books _____ blue. They _____ English books. 8. Li Lei _____ at school today. He _____ drawing a picture now. 9. Amy and Kay _____ here. They _____ not at home. 10. _____ you teachers? No, we _____ not. We _____ students. 11. My favorite color _____ blue. 12. Tom's brother _____ not in the room.