用a, an, the(不填处用'/'表示)填空 1.This is____eraser and that is____ruler. 2. book is____English book. 3. Is this her ____ baseball? 4. —What color is ____ schoolbag? —It's yellow. 5. Mike is at____school. 6. ____orange is____orange. 7. Is that your____notebook in____ lost and found case? 8. —What's this? —It's____ID card. 9. —Is that____watch? —No,it isn't. It's____set of keys. 10. ____ baseball is white.