13 on the health of the workers.

　　Of course 14 there were real disasters which attracted the attention of governments and which showed the need for changes. Also scientists who were doing research into the health of workers sometimes produced information which governments could not 15 . At such times, there were inquiries into the 16 of the disasters or the problems. New safety rules were often 17 as a result of these inquiries; however, the new rules came too late to protect the people who died or who became 18 ill.

　　Today many governments have special departments which protect 19 and workers. In the U. S. , for example, there is a department which tests new airplanes and gives warnings about possible problems. It also makes the rules that aircraft producers must 20 . Another department controls the foods and drugs that companies sell. A third department looks at the places where people work, and then reports any companies that are breaking the laws which protect the health and safety of workers.

　　A. effects B. follow C. necessarily D. regulate

　　E. dangerous F. developed G. efforts H. seriously

　　I. introduced J. causes K. sometimes L. customers

　　M. invented N. technicians O. ignore

　　II. F 12. E 13. A 14. K 15. O 16. J 17. I 18. H 19. L 20. B