She was so smart that she was able to solve the maths problem

----- Nội dung dịch tự động từ ảnh -----
1. She was so smart that she was able to solve the maths problem.
=> It was
2. It was confident of him to say that everything would go as planned.
=> He was
3. It was surprising for visitors to find that the country has changed dramatically within a very short time.
=> Visitors were
4. Everyone was glad when they learned that the government had decided to invest more in education.
=> Everyone was
5. They know very well that it will be much safer to have elevated walkways for pedestrians.
=> They are