Question VI: Fill in each gap with one suitable word to complete the following passage. (10 pts)
About twenty percent of the world’s present energy already (1)___comes_____ from the sun in one form or another. Special devices have already been made to (2)_
put:-SS____ on the roofs of houses and flats to (3)__
catch____ the sun’s ray and thus heat water.
Thousands (4)____
_of___ these devices are now being used to provide (5)__
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|______ in houses throughout the United States while more (6)__
than____ a million solar water-heating units (7)_
have_____already been built in houses in Japan. Other purposes for which solar energy is at present being used include the removal of salt (8)_
from____ seawater and sewage disposal. For most people (9)__
in____ developing countries, the need is not for air- conditioners or central heating but for cheap ways of (10)__
cooking___ food, drying crops and lighting houses.
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