A fire took place in our house last night and _______ were burned/
A.a half books of mine B. my half of books
C.half my books D. my books of half
请问如何选择，如何搭配这些词？
There isn't much _____ I can do , ______ makes me disppointed.
A.that;which B.which;that C.that;what D.what ;which
为什么选A不选D？
Let's hang up some paintings on these _____ walls/
A.vacant B.blank C.bare D.empty
为什么选C不选B？

第一题C,a half of books=half books
第二个，你可以试着读一下句子，没有那个横线也是可以读通的，对吧？
所以正确的应该选that，不充当任何句子成分可以省去。
而如果你错选了what那就不能省去了。

第三个，形容墙时一般都用“裸露”的，而不是“空白”的，因为在外国人看来，颜色是“覆盖”上去的。这是文化理解问题了。