已知正项等比数列$\left\{a_n\right\}$满足：$a_7=a_6+2a_5$，若存在两项$a_{m,}{a}_n$使得$\sqrt{a_m{a}_n}=4a_1$则$\frac{1}{m}+\frac{4}{n}$的最小值为（    ）．

补写出下列句子中的空缺部分。

①山暝听猿愁，沧江急夜流。____，____。（宿桐庐江寄广陵旧游）

②君不见，____，____。（明妃曲二首）

③晨起动征铎，____。（商山早行）

阅读理解

    Hi, I'm Mo Hongwei from Changsha, Hunan. I'm going to enjoy myself during the New Year holiday. On 1st January, I'm going to stay at home and do my homework. On the morning of 2nd January, I'm going to meet my grandfather's friend Mr. Smith at the train station. In the afternoon, I'm going to take Mr. Smith around my school. In the evening, we're going to have a welcome party for him. On the morning of 3rd January, I'm going to ask Mr. Smith to teach me to write with the left hand. And I'm going to ask him to give me some advice(建议) about reading. I think my New Year holiday is going to be fun.