Краткое пояснение: Преобразуем прямую речь в косвенную, используя союз that и изменяя время глаголов.
- The scientist said that they had discovered a new method of drug delivery.
- The professor said nanoparticles would change the future of medicine.
- Dr. Adams said that he was working on a cure for cancer.
- The researcher said the experiment hadn't succeeded because of a technical problem.
- The article said robots can perform non-invasive surgery very precisely.
Ответ: смотри решение