Their explicit target was the new "mechanical devices" that "threatened to make good the prediction that 'what is whispered in the closet shall be proclaimed from the house-tops.'"
1.make good这里的good词性是形容词吗?
2.that引导的定语从句,指代the prediction,但that在从句中是做什么成分呢?后面的介宾短语in the closet是做状语修饰前面的主语从句吗?
请老师指点