Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the question.

The world today is faced the questions or threats. The most dangerous threat of all is war, and after the threat of war is (1) ________. People all over the world worried about things that are happening to the environment. Actually, it is man that is destroying the surrounding with (2) ________ kinds of wastes from the devices that make human lives more comfortable and convenient. Everybody knows that motorbikes and cars emit dangerous gases (3) _______ cause poisonous air and cancer, but no one wants to travel on foot or (4) _________ bicycle. Manufactures know that wastes from factories make water and soil polluted, but they do not want to spend a lot of their money on (5) _______ the wastes safely. Scattering rubbish is bad for our health, but no one wants to spend time burying it. Is it worth talking a lot about pollution?