Good idea! I totally agree with you. 好主意！我完全同意你的意見。

We are all for your suggestion as to how to render better service. 我們完全同意你關于提供更好服務的建議。

I think you are right. 我認為你是對的。

Excellent! That's exactly what I think. 好極了！那恰恰是我所想的。

That sounds reasonable. We need to get the best possible deal. 聽上去有道理。我們應該獲得更好的交易條件。

I share your views. 我同意你的意見。

I support your opinion. 我支持你的意見。

I've no objection. 我沒反對意見。

I'm in favor of your proposal. 我贊成你的意見。

Suits me fine. 這對我合適（我同意）。