网友这个问题，不够明确。

1.A "sliver democracy" that spends far more on the the elderly than on eduction and child care. 

——on eduction and child care：这里，在child care 之前不能再加on，那就犯了重复的错误。一个on 管着两个名词，这叫“介词共享”。

2.The key is to try and avoid a debate over whether your loved one is sick.

——try and avoid，都没有介词啊。

3.Western culture's continuing development then led to the Scientific Revolution,the Enlightenment,the American Revolution, the Industrial Revolution and to what is considered today as modern civilization.

——第二个 to 必须有，这样做是为了明确告诉读者，前面省去了led，不然的话会造成误读。