我认为最好的行动方案是给他写信。

I think the best ___course ___of ___action would be to write to him.

然而，我认为在这种情况下最好的做法是给我们学生退款。

However, I believe that the best ___course ___of ___action in this case is to give our student a refund.

经过仔细分析，委员会提出了一个可行的行动方案来解决这个问题。

After careful analysis, the committee suggested a viable ___course ___of ___action to address the issue.