Directions: Select the appropriate word from the given options and fill blank (iii).

Directions: In the following passage, for each numbered blank, five words/phrases are suggested, one of which best fits the blank appropriately.

As the temperature rises during the summer season, many households turn to air conditioners to keep them cool. Air conditioners, which were once regarded as a residential luxury, have now become a __(i)__. Enjoying a cooler atmosphere during hot weather is not the only benefit of using the air conditioner A household, a vehicle, or a building becomes cleaner and safer for breathing as air conditioning also prevents the growth and spread of harmful microorganisms.
However, along with the benefits, some disadvantages are also __(ii)__ with it. One of the most controversial topics attached to the subject of air conditioning deals with some of the materials that are used to produce the cooling affect – Fluorocarbons. These refrigerants contribute to global warming and are regarded as one of the main ways in which air-conditioning __(iii)__ the environment. Fluorocarbon refrigerants also add to the problems concerning ozone layer depletion.
While air conditioning provides a temporary relief and makes heat wave more bearable, many questions have been raised on how much the world will pay in the long run in terms of the environmental damage that it has caused. Today, scientists are __(iv)__ on making more environmental friendly products, but for now, individuals are __(v)__ to part with their instant cool during the thick of summer.