题目内容：

根据所拾提示，完成句子。每空一词，含缩略词。

1.Paula used to be popular in school.（改为否定句）

Paula ________ ________ to be popular in school.

2.We're supposed to shake hands when meeting someone for the first time.（对划线部分提问）

________ are you supposed to ________ when meeting someone for the first time?

3.His parents take pride in what he has achieved in his study.（改为同义句）

His parents are ________ ________ what he has achieved in his study.

4.我的家乡发生了巨大的变化。（完成译句）

Great changes have ________ ________ in my hometown.

5.中国高铁世界闻名。（完成译句）

China is ________ ________ its high-speed railway in the world.