mainly on natural resources , the prosperity of the city was _______ and its economy almost collapsed when coal prices began to fall in 2012.

The workers are so _____ to the noise ofthe machine that they don’t even notice it during their work

That day they ________ there on foot, but they took a taxi. The place was only 50 meters away from the railway station.

This field of scientific research remains________.

Everything________life in the spring with the warm weather and long days. [ ]