ADMICRO

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.
Bacteria are the smallest known living things with a cellular structure. These colorless, one-celled micro-organisms exist (1)......... organic matter is found: in soil, in water and in the air. Since most of them have no chlorophyll, they cannot use light energy to synthesize their food, (2).......... green plants do.They must get their food in other ways. In this, bacteria resemble animals. However, since they are enclosed in a cell wall, they can only (3)........ dissolved food like plants do. Although most bacteria do not contain chlorophyll, some of them can make their own organic food from simple inorganic (4)...... . They do not, however, use light energy for this purpose. Others get ready-made food from dead  plants  and  animals.  Still  others  are  parasites.  Parasites  are (5)....... to  enter  other  living organisms and take food from them. In doing so, they often cause diseases or the death of their hosts.

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

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