用am, is, are填空。

1. Excuse me! ______ this your eraser? 

2. What ______ those? ______ they birds? 

3. This ______ his ruler. Where ______ my ruler?

4. I ______ in Class Three. ______ you in Class Three,too?

5. ______ these her English books?

6. Those ______ their apples. Where ______ his apples?

7. She ______ eleven. How old ______ that boy?

8. He ______ my friend. ______ your friend a boy or a girl?

9. ______ those maps? No,they ______ not. They ______ pictures.

10. These ______ your bananas. Here you ______.