1. The ... of Facebook is useful because it has helped people communicate with each other (invent)
2. She wrote a book on....science for prospective doctors(medicine)
3......is one of the most important new sources of energy(electric)
4. A new kind of telecope will be invented to help...explore the other planets in our Solar system(science)
5.....said fuel used and carbon dioxide relased from vehicles would be cut down by a new cruise control(technic)
6. Einstein was one of the greatest....in the world(science)
7. This is a great...on his previous work(improve)
8. She made a career as an....of quick-selling gadgets(invent)
9. Work experience is usually highly....for students(benefit)
10. This decision marked a fundamental...in pocily(transform)