Объяснение:
1. Name the seas washing the territory of our country.
2. Being very busy, he postponed his business trip.
3. Hearing footsteps, he raised his head.
4. Having visited several cities of our country, they returned to the capital.
5. This is an engineer who uses the latest achievements in his project.
6. Students learn methods that improve research work.
7. While reading the article, he took notes.
8. Having received new information, we were able to continue our work.
9. By pressing the keys, the operator makes the machine work.
10. He left, refusing to help.
11. Tourists often visit the church, built in the 15th century.
12. Books written by Agatha Christie are read all over the world.
