Exercise 3. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase for each of the numbered blanks from 11 to 15.
TREES FOR LIFE
Trees are among the biggest and longest-living things on Earth, some dating back longer than the oldest buildings. But (11)_______ being nice to look at, trees also play an important role in improving the quality of our lives.
On a world-wide (12)_______, forests help to slow down the effects of global warming by using up the gas known as carbon dioxide and giving (13)_______ the oxygen we need to breathe. At local neighborhood level, trees also (14)_______ important environment benefits. They offer shade and shelter, which in (15)_______ 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.
(11)
A.as far as
B.as long as
C.as well as
D.as soon as

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