A．enough
B．crowd
C．cloud
D．house

A．The child clears its body of bacteria.
B．The body loses liquids without any control.
C．The child has diarrhea in a developing country.
D．The body controls its fluid levels.

A．the life-saving ways are medically effective
B．their parents are rich enough for the life-saving techniques
C．the life-saving techniques are easy to use
D．their parents learn the life-saving techniques