giúp mình với mng oiwsii mình vote 5 sao 1. Road transport is a major source of emission of primary __________, especially in cities. (pollute) 2. Pollution is posing a serious threat to the __________,balance of the oceans with many species being on the verge of extinction. (ecology) 3. Cooking with wood is also a cause of __________in many countries. (forest) 4. There are some major infectious diseases for which __________ have not been developed. (vaccinate) 5. Clearly, there are human factors behind the extensive damage caused by __________ storms. (catastrophe) 6. Most of courses are now credit-based, which brings more __________ in the program schedule. (flexible) 7. Entry to university is competitive so some _______ with the minimum entrance qualifications will find themselves without a place. (apply) 8. Students also have the opportunity to choose from a wide range of _______ courses in the university. (opt) 9. Mr. Pike provided us with an _______ guide to the full-time and part-time programs on offer to a range of candidates drawn from schools and colleges. (inform) 10. Work experience is an important _______ experience for young people (educate) 11. Developments vary from apartment blocks and hotels to modern luxury ______ with swimming pools, solariums, restaurants and a host of other facilities. (complex) 12. The ______ of refined Shanghai ladies of the first half of last century is long lost. (elegant) 13. Digging in her garden, she ______ a hoard of gold dating back to the ninth century. (cover) 14. The ready ______ of guns has contributed to the escalating violence. (available) 15. The earthquake caused loss of life and property ______(destroy) 16. They design and carry out projects aiming to reduce fossil fuel consumption, find______fuels for public transport, and promote other clean air efforts. (exhaust) 17. The urban planners are working for Eco Infrastructure Network, whose main function is to deal with urban environmental problems to make Super Star City greener, cleaner, and more ______(sustain) 18. Many city______, especially those in developing countries, still live in poverty. (reside) 19. The noise is barely ___________ by the human ear. (detect) 20. Some legal experts think the agency may have exceeded its ___________(author)