脸上长小红疙瘩怎么办:几个英语问题。天啊！我已经没救了！

At the shopping centre,she didn't know what to buy and left with an empty bag.
what to buy 在此处起名词词组作用（即作一个名词用），做know的宾语。

The window is believed to be broken by Jack.
is believed to be broken →（we） believed Jack to break the window。这里，believed Jack to break the window是复合宾语结构，这种结构由“主语+及物的谓语动词+宾语+宾语补足语”构成。宾语与宾语补足语有逻辑的主谓关系，若无宾语补足语，则句意不完整。可以用做宾补的有，名词，形容词，副词，介词短语，动词不定式，分词。

In my opinion,it's the best use that could be made of this money.
it's the best use that could be made of this money→that could be made of this money is the best use 可见，这是that引导的主语从句，that引导的主语从句既可以放在句首也可以放在句末，在实际应用中我们常常采用it形式主语的形式。又如：
That he passed the English test is true. 千真万确，他通过了英语考试。→It is true that he passed the English test.

whatever和no matter what有何区别？
虽然no matter what和whatever都表示“无论什么”，但是whatever引导的是宾语从句，而no matter what引导的是让步状语从句。

whatever和no matter what中whatever还可引导名词性从句
In my opinion,it's the best use that could be made of this money.是一个定语从句

语法啊 ？

我不善长，不过仔细阅读发现第一题有问题啊。
根本没有“know”啊。