5. We offer the best services with a …….staff, who are always thoughtful and courteous to customers. A. hard worked B. well-trained C. well-listened D. bad tempered 6. Human beings are destroying the air by adding …………….to the environment. A. funds B. species C. animals D. pollutants 7. The number of rare animals is ………….so rapidly that they are in danger of becoming extinct. A. rising B. decreasing C. growing D. increasing 8. The number of rare animals is decreasing so rapidly that they are in danger of becoming……... A. extinct B. advanced C. crowded D. developed 9. Efforts have been made to ………….the rare animals on the Earth. A. co-exist B. decrease C. protect D. disappear 10. Thousands of national parks all over the world have been established to protect ……….animals. A. common B. endangered C. offspring D. huge 11. Because fossil fuels are limited, we have to develop and use …………….sources of energy. A. clean B. alternative C. different D. cheap 12. Because power demand is increasing very rapidly, fossil fuels will be ……within a relatively short time. A. exhausted B. developed C. explored D. found 13. The sun ………….large amounts of energy every day, which can be changed into electricity. A. absorbs B. releases C. uses D. increases 14. Solar panels on the roofs of houses can create enough ……..to heat and cool an entire house. A. potential B. source C. strength D. energy 15. The amount of fossil fuels in the world is ……………….and non-renewable. A. limited B. unlimited C. plentiful D. alternative 16. Our sports performances have been …………….considerably over recent years. A. updating B. protecting C. strengthening D. advancing 17. The quality of athletes, officials and sports …………has been developing through time. A. facilities B. tools C. structures D. bases 18. The Vietnamese participants took part in this sports event with great………………….. A. difference B. enthusiasm C. gymnasium D. athletics 19. Our efforts were highly ……………………when we won 3 gold medals. A. given B. appreciated C. thought D. realised 20. The Asian Games are held for the purpose of developing …….knowledge and friendship within Asia. A. intercultural B. international C. interval D. personal 21. He is very capable ……………learning and understanding things. A. up B. for C. in D. of 22. The post office offers the …………..Mail Service which is particularly fast. A. Secure B. Efficient C. Reliable D. Express 23. The panda’s ……………habitat is the bamboo forest. A. nature B. natural C. naturalize D. naturalism 24. The main threat to the ………………of these creatures comes from their loss of habitat. A. survive B. survival C. survivors D. survivability 25. What exactly is the influence of air pollution ………………the human beings? A. on B. of C. with D. for 26. The amount of solar energy that reaches the Earth depends ………. the atmosphere. A. on B. of C. with D. for 27. Natural environment consists ……………… all natural resources. A. on B. of C. with D. for 28. The Asian Games have been advancing …………… all aspects. A. in B. of C. with D. for 29. Scuba diving and windsurfing are both aquatic sports. A. field B. water C. combat D. individual 30. Football fans gathered around the TV in the corner of the club to see the final. A. assembled B. collected C. wandered D. reached