III. Choose the best answer to complete the following sentences.
1. Sam _________ dinner 3 times this week
A. has cookedB. has been cooking C. have been cookingD. cooked
2. . ___________ the desalination plant, the company could offer an effective solution to the problem of water scarcity.
A. To bulidB. Having builtC. Being builtD. Having beeen built
3. Why are your hands so dirty? – I ___________ my bike. I have yet to finish it.
A. repaired B. have been repaired C. has been repairedD. have been repairing
4. It was in 1989_________ the Berlin Wall collapsed.
A. whichB. whatC. whenD. that
5. .He graduated with doctorates of _______ and surgery from Florence, gaining the highest honors that year.
a. medicine b. medical c. medicate d. medication
6. . _______________ skills help us analyze a problem scientifically.
A. AcademicB. VocationalC. AnalyticalD. Practical
7. Global warming is an increase in the average _______ of the earth’s atmosphere.
A. climateB. balanceC. temperatureD. vehicle
8. Air ________________ is threatening the health of older people and children.
A. pollutionB. acid rainC. deforestationD. global warming
9. Global warming also has __________ impact on water supplies.
A. stableB. severeC. infectiousD. easy
10. A(n) _________disease is an illness that can be passed from one person to another.
A. dangerousB. chemicalC. man-madeD. infectious
11. Global warming leads _______ climate change.
A. inB. toC. onD. from
12. You are old enough. I think it is high time you applied _______ a job
a. in b. of c. for d. upon
13. The ozone layer helps ________________ us from the sun's rays.
A. changeB. reduceC. protectD. release
14. Many countries have signed up to international agreements which aim to reduce the negative ___________ of climate change.
A. diseaseB. illnessC. emissionD. impact
15. The public praised the local farmers for ___________ milions of trees on the surrounding hills.
A. plantB. being plantedC. being plantingD. having planted
16. Jonathan ___________ in God since he was a child
A. believedB. has believedC. has been believing D. have been believing
17. The test was so long and difficult; ………….., I finished it on time.
A. therefore B. so C. but D. however
18. We’ll focus ______the effects _____global warming ____ people’s health and life on Earth in general.
A. on/in/onB. on/ of/inC. on/of/onD. in/of/on
19. Using chemical _________ for farming is one of the causes of global warming.
A. deforestationB. fertilisersC. heat-relatedD. water supplies
20. Global warming is an increase in the average _______ of the earth’s atmosphere.
A. climateB. balanceC. temperatureD. vehicle
contributes to global warming.
ending def _________ 
at the COP.
has increased the amount of gre______ ________ 
in the earth's atmosphere.