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1lack的用法：本身有名词和及物动词两种词性（lack for nothing特殊）本题用动词的ing形式表省略
另外,lack有一固定用法,be lacking in 在这里lack 可视为形容词,本题可以填lacking in .
2A选项表目的.例如:I study hard so as to go to a good university .
CD选项都可以引导结果状语从句,such 后接名词,so后面接形容词或副词.例如;She is such a beautiful girl that everyone likes her.He runs so fast that no one can match him .
B选项有些复杂.such 和 as to 不是一起理解的.such
是对前面主语的指代.像Such is Tom.(汤姆就是这样的人.一般如果后面没有其他成分,这种倒装形式很地道,正常表述为Tom is such.) 后面的as to 引导结果状语.
======以下答案可供参考======
供参考答案1:
lack of 里面的lack是名词
I couldn't hide my lack of enthusiam
lack当动词可以是及物的也可以是不及物的
不及物+for
such as to 固定搭配：达到如此程度以致
His illness is such as to cause anxiety
供参考答案2:
何在？