用am, is, are 填空:
1. It ____ a cat.
2. You ______ my friend.
3. She ______ beautiful.
4. My mother ______a teacher.
5. The dogs _______ playing.
6. He _____ a good boy.
7. Your friend ______ singing.
8. We ______ students.
9. They _______ pandas.
10. Linda and I ______ fine, thanks.
11. My name _____ Jane.
12. I ____ Gina.
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