該怎樣使用agree about /with/on

問題1:
請問該怎樣使用agree about / agree with / agree on .
問題2:
請填介係詞並解釋原因
I did't agree ____ a word of what she said.
問題3:
為什麼這個空格是填on而不是 about或with.
The government has agreed [on] a public inquiry into the helicopter crash.
2 answers 2