根据短文内容，用方框中所给的单词的正确形式填空，使短文通顺、完整。

    In1997, Bobbi McCaughey gave birth to seven babies. They all survived(存活). This autumn, McCaughey's children are preparing to have ____18th birthday.

    Eighteen years ago, the birth of McCaughey's seven children was huge news across the world. Bill Clinton, American President at that time,____ the family and congratulated them. Doctors worried that they wouldn't survive their first few days, but they did. Many people helped them and they grew up____.

   "Somany things have happened in 18 years. All the happiness and ____are special to us,"said Mum Bobbi McCaughey. Now her children are____to graduate from high school.

设a，b都是正数，求证：${\left(\frac{a}{b}\right)}^2+{\left(\frac{b}{a}\right)}^2\ge \frac{a}{b}+\frac{b}{a}$  .

我国濒临的四大海域中最南端的是（   ）

“量小失众友，度大集群朋”说明要交往有度，纯化友谊。（    ）