Здравствуйте,вот ответы:
Exercise 3.
1. But of course there are dangers as well as
2. Already today Virtual Reality is used in medicine
3. In the Virtual system is still in early stages of it's development.
4. But it's also used in training police trained schools.
5. Not long ago computers were considered an amazing invention
Желаю удачной учёбы ;)