这是唯一剩下的苹果了。

This is the ___only apple left.

她上个月才开始学习钢琴。

She started learning piano ___only last month.

我匆忙赶到机场，结果发现航班取消了。

I rushed to the airport ___only to find my flight was canceled.

这只是个小问题，不要太担心。

It's ___only a small issue, don't worry too much.