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Practice Reading: Fill in The Blanks (Drag & Drop) ID: #34210 A clean river
Instructions
* Drag the correct answer into all target fields
A  clean  river  nurtures  plankton  and  water-weeds,  which  are  the  food  and    of  small  fish.  This  natural  cycle  of  life  becomes  a  feature  of  any  stretch  of  water;  even  an  artificially  created  piece  of  water  like  a  pond  or  a  canal  will,  if  left  alone,  start  its  own  life  cycle,  beginning  with  things  that  wriggle  in  the  mud.  In  a  short  time,  small  predators  will  move  in,  and  a    little  food  chain  will  have  started.  All  water,  whether  still  or  flowing,  is  richly  productive,  for  where  there  is  water  there  is  life.  You  often  see  people  fishing  in  a  narrow  water  channel;  they  fish  in  ponds  the  size  of  puddles,  in  streams  that  look  like  gutters.  And  they  are  nearly  always    with  a  catch.  The  combination  of  water  and  organic  matter  can  always  be  counted  upon  to  produce  some  kind  of  living  matter.  The  one    is  that  the  water  must  have  a  certain    of  oxygen,  for  all  life  needs  some  oxygen.  In  other  words,  it  must  not  be  polluted  with  chemicals.

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