Помогите пожалуйста: Дайте подходящие формы глаголов вместо инфинитивов1. Teachers (to

Помогите пожалуйста: Дайте подходящие формы глаголов заместо инфинитивов
1. Teachers (to know) that with the conventional methods the better part of a math lesson (to spend) on putting down the solutions of problems (as a rule children write slowly) and calculations.
2. The teacher slowly (to dictate) the problem, while the children (not to write) but (to listen) attentively and thinking about the development.
3. The introduction of a new course in schools (to make) it imperative to reorient the higher educational establishments, too: over a hundred faculties and departments (to open) to provide training in information science and computer technology.