Water is the“l(fā)ife blood”of our earth．Like air and sunshine，it is very important  1  living things．Without water，there can be  2  life on the earth．All animals and plants need water. Man also needs water．We need water to drink，to cook and to clean  3  ．It even  4  the greater part of our bodies．

Water is almost everywhere．Even in the  5   places of the world，there is water in the air．However．we can drink not seawater but fresh water．To make things even  6   ，people often  7  to keep the water clean．They throw rubbish into rivers，lakes or seas．So not all the fresh water is  8  for us to drink．We’re short   9   water．Something must be   10   to stop this．

1．A．by           B．to                 C．of                   D．towards

2．A．none       B．not               C．much              D．no

3．A．himself    B．our               C．us                  D．ourselves

4．A．made of    B．make           C．makes up               D．made in

5．A．driest      B．wetter           C．drier               D．beautiful

6．A．best        B．worse           C．worst             D．better

7．A．decide    B．try                C．fail                 D．take

8．A．clean enough B．enough clean C．enough good    D．dirty enough

9．A．for          B．in                 C．a(chǎn)t                   D．of

10．A．do         B．did               C．doing              D．done