用 be( am, is, are) 的适当形式填空。
1. Excuse me! ______ this your ruler?
2. What______ those?______ they pictures?
3. This ______his backpack. Where ______ mine( 我的 ) ?
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.
10. These ______ your bananas, Jim. Here you
