她听到我们说话只是运气不好。

It was just ___bad luck that she heard us.

如果现在对您来说不方便，我稍后再打给您。

I'll call you later if this is a ___bad time for you.

他考试运气不好，但下次会更努力的。

He had ___bad luck on his exam, but he'll try harder next time.