短文填空请用适当的词完成下面的短文，并把所缺单词填写在答题卡指定的位置上。每个孔只能填写一个形式正确、意义相符的单词。

The Great Wall is known as the eighth wonder of the world. Every year thousands of tourists from all over the world come to visit this place of ____ in China.  
Last Saturday I went to theGreat Wall ____   some of my friends. It was a sunny day. On our way up, we saw many volunteers(志愿者) keeping working in the sun. They helped the elders with their bags., ____ photos for some tourists and answered people’s questions. Though they are very____ , they didn’t stop to have a rest. We were deeply moved when we saw this.

Just at the moment, we saw ____  little boy standing alone and crying. We went over and asked what ____ to him.  From his answer we knew that he couldn’t find his mother. We told him not to ____  about it and then we tried to get to touch with his mother with the phone number he gave us. Twenty minutes ____   , his mother turned up. When she saw her son, she was very excited and thanked ____ with tears in her eyes. 

That day we not only enjoyed the beauty of the Great Wall, but also felt the warmth of the society. ____  everyone can reach out a helping hand to others, the world will be more and more harmonious(和谐的).

《左传》有云：“昔周公、大公股肱周室，夹辅成王。成王劳之，而赐之盟，曰：世世子孙无相害也。载在盟府，大师职之。”材料表明（    ）

通过分析，发现销售量y对奶茶的价格x具有线性相关关系．

（Ⅰ）求销售量y对奶茶的价格x的回归直线方程；

（Ⅱ）欲使销售量为13杯，则价格应定为多少？

注：在回归直线y= $\hat{b}x+\hat{a}$ 中， $\hat{b}=\frac{{{\displaystyle \sum }}_{i=1}^n{x}_i{y}_i-n\overline{x}\overline{y}}{{{\displaystyle \sum }}_{i=1}^n{x}_i^2-n{\overline{x}}^2}$ ， $\hat{a}$ = $\overline{y}$ ﹣ $\hat{b}\overline{x}$ ． ${\displaystyle \sum }_{i=1}^4{x}_i{}^2=5^2+{5.5}^2+{6.5}^2+7^2$ =146.5．

我国进入社会主义初级阶段是在（    ）之后