她给我的项目提供了一些建设性的建议。

She gave me some ___constructive advice on my project.

他的评论总是有帮助且建设性的。

His comments were always helpful and ___constructive.

我们进行了一次建设性的讨论，最终找到了解决方案。

We had a ___constructive discussion that led to a solution.