Sometimes people forget how we depend

Choose the letter A, B, C or D to complete the passage below

Sometimes people forget how we depend __________ (6) nature and environment surrounding us. We spend mindlessly __________ (7) resources given by nature and believe that they are unlimited. Over the last millennia the population on the planet grew immensely and our needs increase with every year. We achieved great breakthrough in industry __________ (8) other fields of production. But this growth resulted in poor environmental conditions. It seems that every achievement and advancement only __________ (9) damage to nature.

We __________ (10) natural resources thoughtlessly for many years. Once we exhausted one resource we started to use up another alternative. Have you ever thought what our life will be when coal and oil will come to the end? Plug-in hybrid vehicles are good solutions for the fuel crisis to come.