The world is running out of oil, and energy experts believe that there could be serious shortages in ten years' time. Not only is each individual using more oil than ever before, as the standard of living in industrial countries arises, but the 【S1】______ population explosion means that each year many more people will be using oil in some form. or other. Until recently we took oil as granted: it seemed it would never stop flowing. It was so 【S2】______ cheap and plentiful that the whole world came to depending on 【S3】______ it. Governments neglected other sources of energy. Electricity was generated from oil and power stations were fired by it. It found its way into much of the products of light industry. 【S4】______ Many people are surprising when they learn how many items 【S5】______ in their homes contain oil; The increase in the price of oil has brought the world to its senses. Governments are searching 【S6】______ a suitable alternate ,but so far in vain. They are considering 【S7】______ how they can make better use of the two other major fuels coal and natural gas, but they have found that neither can take place 【S8】______ of oil in their economies. In recent years there has been a growing concern for the environment, and coal is a popular fuel 【S9】______ with environmentalists. Coal mines are ugly, and their development has a serious effect on animal and plant life; coal itself is a heavy pollution. 【S10】______ 【S1】