I. Vocabulary: A. Choose the best option: 1. A___ is a large area of sea that is partly surrounded by land. A. earth B. seabed C. gulf D. sea 2. Scientists have been able to ___ the life of plants and animals that live under the sea. A. investigation B. investigating C. investigable D. investigate 3. ___ is a term that refers to the existence of different kinds of animals and plants which make a balanced environment. A. biodiversity B. pesticide C. submarine D. organism 4. With………..technology we have now made important discoveries about the biodiversity of marine life. A. modernize B. modern C. modernization D. modernity 5. Some plants and animals depend …….the bottom of the sea like starfish. A. from B. in C. on D. to 6. We should do something immediately to save the Earth ______ being destroyed A. from B. for​C. in​D. at 7. Man is doing harm____________ the environment A. on B. in​C. for​D. to 8. Many people are very concerned about the ___________of the rainforests A. destroy B. destruction​C. destructive​D. destructively 9. Cuc Phuong National Park is ______ 160 km South West of Ha Noi. A. lied​​B. established​​C. abandoned​​D. located 10. The new job will provide you with _______ experience. ​A. value B. valued​ C. valuable​D. invaluable 11. The charity is totally dependent _____ money from the public. A. from​​​B. in​​​C. upon​​D. with 12. The _______ of booking tickets in advance is that you get better seats. A. advantage B. disadvantage C. advantageous D. advantageously 13. _________ is the movement of something around a closed system. ​A. environment ​B. circulation​C. hydroelectric​D. variety 14. We are now facing the possible________ of several rare species. ​A. danger​B. variety C. existence​D. disappearance 15. Carnivores are animals which ......... A. live on the bottom ​B. eat meat C. eat plants D. swim very fast 16. Whales, seals are examples of ........... animals A. river B. tiny C. marine D. land 17. The life ......... of sperm whale can be up to seventy years A. distance B. period C. length D. span 18. These birds _____ to North Africa in winter. A. settle B. go ​ C. relocate ​D. migrate 18. Acid rain has caused severe _______ on the hillside. ​a. erosion b. pollution c. destruction ​d. floods 19. A large hydroelectric __________was built on the River Danube. ​a. power​b. dam c. bank​d. wall 20. _________is concerning or producing electricity by the power of falling water. a. hydroelectricity b. contamination c. circulation d. biodiversity 21. A state of being polluted is called ____________ a. contamination b. environment c. samples d. existence 22. Her _______ of English grammar is very extensive. ​A. know B. knowable C. knowledge​D. knowing 23. Endangered animals should be bred in _________ areas. A. conservative​​B. conservable​​C. conservation​D. conservancy 24. Many rare…….. of animals are in danger of extinction. A. species ​​B. classes ​​C. being ​​D. pairs 25. The heavy rain has caused ……….. in many parts of the country. A. crops ​​B. floods ​​C. water ​​D. soil