Поставьте глаголы, данные в скобках, в нужном времени и залоге. Предложения переведите.
1. On April 12 mankind (to enter) a new era – the era of mastering space.
2. Next month we (discuss) their problem at the conference.
3. Yesterday these important problems (to discuss) in our laboratory.
4. This month important observations (to make) in cosmic spасе.
5. In the first year the students (to teach) a lot of important subjects.