difficulty|difficulties

我们完成了工作，但非常困难。

We finished the job, but only with great ___difficulty.

任务的难度让他们兴奋。

The ___difficulty of the task excited them.

她找工作有很大困难。

She had great ___difficulty finding a job.

公司正面临一些严重的困难。

The company is facing some serious ___difficulties.

我在使用新软件时遇到了困难。

I'm having ___difficulties with the new software.

如你所知，我的家庭有经济困难。

As you know, my family has financial ___difficulties.