Trees are among the biggest and longest-living things on Earth, some dating back longer than the oldest buildings. But (1)___ being nice to look at, trees also play an important role in improving the quality of our lives. On a world-wide (2)_, forests help to slow down the effects of global warming by using up the gas known as carbon dioxide and giving (3)_ the oxygen we need to breathe. At local neighborhood level, trees also (4)_ important environment benefits. They offer shade and shelter, which in (5)_____ reduces the amount of energy needed to heat and cool nearby buildings; at the same time, they also remove other impurities from the air we breathe.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks

(1) ................

A. as far as

B. as long as

C. as well as

D. as soon as

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