1. Whose book is that？

2. Whose pencil is this on the floor？

3. Whose bike is parked outside the school gate？

4. Whose backpack is this on the bench？

5. Whose lunchbox is this leaving from the classroom？

6. Whose sweater is this left in the locker？

7. Whose soccer ball is rolling on the field？

希望这些例句能帮助五年级学生更好地理解和使用"whose"这个词。