Question

①1. is known to all, fish can’t live without water.

②He saw the girl, 2. delighted him.

③Keep away from such persons 3.will do you no good.

④4. is often the case with children, Amy was better by the time the doctor arrived.

Answer

1.As

2.which

3.as

4.As

【解析】

1.As is known to all众所周知，是固定短语，所以填As。

2._______2_______ delighted him.作定语，修饰整个主语内容，所以_______2_______ delighted him.是一个非限制性定语从句，填which。

3.当先行词是“such/the same+名词”时，用as引导定语从句。即，such+n.+as(代词)，the same+n.+as(代词)，所以填as。

4.从句置于句首只有引导词as 可以。as引导的为限制性定语从句，as在句中作主语，指代后面的整个句子。句意：就像孩子们常有的情况一样，等大夫到了艾米的情况就好多了。