句型Whose...is it? It's... — 英语填空题
题目
在学校失物招领处有三样物品：一顶帽子、一把雨伞和一个水壶。帽子上的标签写着 'Sarah'，雨伞上的标签写着 'Oliver'，水壶上没有标签，但Oliver说：'The water bottle is mine, not Sarah's.' 请补全对话（每空一词）：
1. — ___ hat is it? — It's ___ hat.
2. — Whose umbrella is it? — It's ___ umbrella.
3. — Whose water bottle is it? — It's ___ water bottle. (填 he 的形容词性物主代词)