Тема Инфинитив. Переведите предложения

1 To master this speciality is very important.
2 To understand the data we must make several experiments.
3 To cut down the flow of water in the pipe you need only to shut off a valve.
4 To be a successful scientist one must possess certain characteristic qualities.
5 To work in this field of science was the task of the engineer.
6 What makes you think you are right?
7 I shall do all I can to help you.
8 The child was happy to have been brought home.
9 Jane remembered to have been told a lot about Mr. Rochester.
10 The children were delighted to have been brought to the circus