对于许多老年人来说，如何在冬天保暖是一个主要的担忧。

Keeping warm in the winter is a major ___worry for many elderly people.

他现在最大的担忧是他的财务状况。

His biggest ___worry right now is his financial situation.

幸运的是，我的担忧被证明是毫无根据的。

Fortunately, my ___worry proved to be unfounded.