Ⅴ.补全对话。
Miss Wu: Children! The Double Ninth Festival is coming. What can you do for your grandparents?
Sally:1. He is old. I can do some chores for him.
David:2. My grandma likes flowers.
Penny:3. We can eat together.
Simon: My parents and I often have dinner with them together.
Miss Wu: That's great. 4.
Luke:5.
Miss Wu: You're helpful.
A. I want to buy some flowers.
B. I can sweep the floor for them.
C. My grandpa is a farmer.
D. I can make a cake for my grandparents.
E. What about you?

【解析】：
这是一个补全对话的题目，主要考查学生对于日常对话的理解以及对于特定节日（重阳节）相关活动的了解。题目中，Miss Wu询问学生们能为爷爷奶奶做什么，学生们给出了不同的回答。需要根据对话内容，选择最合适的句子填入空白处。
1. Sally的回答中提到“He is old. I can do some chores for him.”，说明她提到的某个人年纪大，她可以做些家务。选项C“My grandpa is a farmer.”提到了爷爷，且暗示了爷爷年纪大，符合Sally的语境。
2. David说“My grandma likes flowers.”，说明他要做的事情与花有关。选项A“I want to buy some flowers.”直接提到了买花，符合David的语境。
3. Penny的回答中提到“We can eat together.”，说明她要做的事情与吃有关。选项D“I can make a cake for my grandparents.”提到了为爷爷奶奶做蛋糕，符合Penny的语境。
4. Miss Wu在Simon回答后问“That's great. 4. ______”，这里是在询问另一个学生Luke的情况。选项E“What about you?”是常见的询问他人情况的表达，符合语境。
5. Luke的回答被Miss Wu称赞为“helpful”，说明他做的事情是有帮助的。选项B“I can sweep the floor for them.”提到了为爷爷奶奶扫地，是一件有帮助的事情，符合Luke的语境。
【答案】：
1. C
2. A
3. D
4. E
5. B