他的工作不差，但仍有改进的余地。

His work isn't bad but there's still some ___room ___for ___improvement.

她的英语不错，但仍有提升空间。

Her English is good, but there is still ___room ___for ___improvement.

这款新软件功能可用，但其用户界面还有很大的改进空间。

The new software is functional, but there's plenty of ___room ___for ___improvement in its user interface.