Questions 7-11 Complete the summary below
Choose NO MORE THAN TWO WORDS from the passage for each answer.
Using Non-Food Crops to Make Biofuels
A major constituent of green plants is cellulose. The
(7)of cellulose are
made up of sugars. These form of the (8)of plants. Ethanol could be produces by
extracting the sugars and allowing them to (9). One common North America plant
that could be used in this method is (10). Some scientists believe that this would be
a more productive source of ethanol than (11). Additionally, the source plant
materials could be grown in ground which is not currently being used for agriculture and
is not
(12) valuable

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