由于那些环境，他的童年尤其艰难。

His childhood was particularly ___hard due to those circumstances.

过去这几年对整个社区来说异常艰难。

These past few years have been incredibly ___hard for the whole community.

适应新国家的生活对她来说是一段艰难的经历。

Adjusting to life in a new country proved to be a ___hard experience for her.