当然，我们不想不必要地惊吓人们，但他们应该被提醒潜在的危险。

Of course we don't want to alarm people ___unnecessarily, but they should be alerted to potential dangers.

社区应该理解不必要地使用私家车的现实影响。

The community should understand the reality of the effects of using private cars ___unnecessarily.

他不必要地在奢侈品上花钱。

He spent money ___unnecessarily on luxury items.