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  • How ______ countries are there in South America?
    17
    15
    14
    12
  • How ______ blood does an adult's body contain?
    10l
    12l
    5l
    7l
  • How ______ protein does an egg contain?
    5g
    7g
    10g
    3g
  • How ______ of the human brain is water?
    76%
    80%
    55%
    73%
  • How ______ does the President of the USA earn?
    $1,000,000 a year
    $200,000 a year
    $400,000 a year
    $500,000 a year
  • How ______ water should people drink a day?
    1l
    4l
    2l
    5l
  • How ______ salt should people consume a day?
    2g
    6g
    4g
    10g
  • How ______ rings does Saturn have?
    5
    7
    8
    6
  • How ______ teeth do adults have?
    31
    28
    30
    32
  • How ______ keys are there on a piano?
    60
    54
    88
    30
  • How ______ stars are on the USA flag?
    45
    36
    50
    24
  • How ______ colours are there in a rainbow?
    7
    6
    5
    8
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