She watched the sunset above the mountain, ........... (She noticed the colours blending softly into one another.)

........... the firefighters finally put out the fire.

Science wasn’t the only thing that appealed to the dashing young man with the walrus moustache. (interested, challenged, worried)

Five years later, the discovery of nuclear fission in Berlin had American physicists in an uproar. (in a state of commotion, full of criticism, in a desperate state)

At the age of 15, Einstein felt so stifled that he left the school for good. (permanently, for his benefit, for a short time)

Einstein got ever more involved in politics, agitating for an end to the arms buildup. (campaigning, fighting, supporting)