如果机会出现，我很乐意去纽约。

I'd be happy to go to New York, if the opportunity ___presented itself.

我会说那是相当好的教育，因为他们知道在机会出现时奖励我们。

I would say that was a fairly good education since they knew how to reward us when the opportunity ___presented itself.

当机会出现时，我们必须准备好抓住它。

We must be prepared to seize the opportunity when it ___presents itself.