可以肯定地说，项目将按时完成。

It's ___safe ___to ___say that the project will be completed on time.

有把握地说，技术已经极大地改变了我们的生活。

It is ___safe ___to ___say that technology has changed our lives dramatically.

鉴于证据，可以肯定地说气候变化是真实的。

Given the evidence, it's ___safe ___to ___say that climate change is real.