WE ARE WORRIED ABOUT THE _________ OF THE FRESH WATER FOR THE WORL...
20. We are worried about the _________ of the fresh water for the world’s population.
A. short
B. shortage
C. shorten
D. shortening
Choose the, word or phrase (A. B, C or D) that best fits the blank space
in the following passage:
Are you looking for a cheap, clean, effective (21)_________ of power that doesn’t cause
pollution or waste natural resources? Look no further than solar energy (22)_________
our Sun.
This power could be provided by the Sun. One percent of the solar energy that reaches
the Earth is enough to provide power for the (23) _________ population.
Many countries are already using solar energy. Solar panels are placed on the roofs of a
house and the Sun’s energy is used (24) _________ water. The energy can be stored for a
number of days; so on (25)_________ days you can use solar energy, too.