Поставить в подходящую форму incredible as may seem, it (contain) strange

Поставить в нужную форму incredible as may seem, it (contain) strange being who are believed to be part of an army from the planet Mars. Soft music (follow). A subtle touch to get people anxious. What ( go on)? The announcer (come) on again. There was a nervy, panicky tone to his voice. He said the sistuation (change) rapidly.