5. The virus is currently ___________ by the top scientists in the country. A. studying B. studied C. being studied D. been studied 6. Technology in the …………of telecommunications has developed over the last decade. A. economy B. field C. space D. development 7. Fish were among the earliest forms of life. They __________ on Earth for millions of years. A. existed B. are existing C. exist D. have existed 8. It is more ______ to buy groceries and make your own meals as it’s expensive to eat in a restaurant. A. economy B. economic C. economical D. economist