阅读短文，根据短文内容回答问题。
Last Double Ninth Festival
Last Double Ninth Festival, my classmates and I went to the old people's home. We visited the old people and they all had a good time.
Lily and Liu Jia cleaned the room for Grandma Wang. She was very happy. She told the girls some old stories. They enjoyed the stories a lot.
Binbin and Qiqi made dumplings for the old people. Grandma Liu helped them. She was eighty-three years old. But she looked very healthy.
Li Yan and Nana sang Beijing Opera for the old people. The old people liked it best. The girls wore beautiful clothes and sang beautifully.
1. What did Lily and Liu Jia do for the old people?

2. Did Binbin and Qiqi sing Beijing Opera for the old people?

【解析】：本题为阅读理解细节题，可直接从短文中定位对应内容得出答案：1. 定位到短文第二段第一句，即可找到Lily和Liu Jia为老人做的事；2. 定位到短文第三段可知Binbin和Qiqi的活动是包饺子，唱京剧的是Li Yan和Nana，因此做出否定回答。
【答案】：1. They cleaned the room for Grandma Wang.
2. No, they didn't.

1. —How was your Mid-Autumn Festival holiday, Binbin?
你中秋假期过得怎么样，斌斌？
—It was great! 非常棒！
注意：Mid-Autumn Festival 是专有名词，三个单词的首字母均需大写。
2. —Did you a trip? 你们去旅行了吗？
—No, we didn't. 不，我们没有。
注意：Did 引导的一般疑问句中，后面的动词用原形。
3. —Did you eat mooncakes? 你们吃月饼了吗？
—Yes, we . 是的，我们吃了。
注意：回答 Did 引导的一般疑问句时，肯定回答用“Yes, 主语+did.”；否定回答用“No, 主语+didn't.”。
4. My mother and I went to a on Sunday.
我和妈妈上周日去看了一场马拉松比赛。
注意：表示“星期”的单词前用介词 on。
5. —What did you like about it?
你喜欢它哪一点？
—I liked watching the runners.
我喜欢看参赛者（跑步）。
注意：like 后可以接动词 -ing 形式，表示“喜欢做某事”。
6. —What did you do last weekend?
你上周末做什么了？
—I an online book fair.
我参加了一场线上书展。
注意：一般过去时的特殊疑问句中有助动词 did 时，谓语动词用原形，但回答时，谓语动词要用过去式。
参考答案：2. take 3. did 4. marathon
6. joined

2. take 3. did 4. marathon 6. joined

2. 这是助动词Did引导的一般疑问句，根据语法规则，助动词did后要接动词原形，“去旅行”的固定搭配为take a trip，因此空处填take。
3. 本题是Did引导的一般疑问句的肯定回答，按照语法规则，肯定回答结构为"Yes, 主语+did."，因此空处填did。
4. 题目给出的中文句意是“我和妈妈上周日去看了一场马拉松比赛”，“马拉松”的英文表达是marathon，前面有不定冠词a，使用单数形式即可，因此空处填marathon。
6. 句子询问上周末做的事，时态为一般过去时，谓语动词要使用过去式，“参加”的英文是join，其过去式为joined，因此空处填joined。