1. Vietnam gained ______________ in 1945. (depend) 2. Sulphur dioxide is a _______________(pollute). 3. Older people are important __________________ to the economy. (contribute) 4. Police are investigating the _______________of a young woman. (appear) 5. The traffic here is very ______________for children. (danger) 6. Luckily, nothing _______________ was stolen. (value) 7. The _________ of school leavers that go to university is about 5 per cent. (percent) 8. Teaching young children is a __________ and rewarding job. (challenge) 9. __________, the light came on, although no one was near the switch. (mystery) 10. We believe in investing in __________ research. (science) 11. They need more funds to ___________ the country’s telephone system. (modern) 12. The whole issue is still under ____________. (investigate) 13. His ___________ in the team has caused controversy. (include) 14. In britain, the ___________ of the country has historically been left to the navy. (defend) 15. Sulphur dioxide is one of several __________ that are released into the atmosphere. (pollute) 16. Every fire destroys ____________ wood, wildlife, and good soil. (value) 17. Satellite photographs provide a wide range of information, ____________ water temperature, depth and the undersea populations. (inclusion) 18. Biodiversity is a term that refers to the ______________ of different kinds of animals and plants which make a balanced environment. (exist) 19. Hydroelectric dams hold back needed water and provide power for homes and ________. (industrialization) 20. We can stop ____________ the problem while scientists search for answers, and laws are passed in nature's defense. (worst) 21. Some are swimming animals such as fishes and sharks that move ____________ of water currents. (depend) 22. Her back injury has made it _______________ for her to play tennis anymore. (possibility)