他恰好有我需要的零件，那真是运气好。

He had exactly the part that I needed so that was ___a ___stroke ___of ___luck.

经过一小时的面试，她被要求第二天就开始工作，这真是运气好。

After a one-hour interview, she was asked to start work the next day, which was ___a ___stroke ___of ___luck.

赢得抽奖对这位年轻艺术家来说真是运气好。

Winning the raffle was ___a ___stroke ___of ___luck for the young artist.