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，我相信在这种情况下，最好的做法是给我们的学生退款。

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

经过仔细考虑，我们选择了一个谨慎的行动方案来解决这个问题。

After careful consideration, we chose a prudent ___course ___of ___action to address the issue.