How to get rid of waste is a great problem for the world today. Waste must be treated 16 it does not become a danger to life.   17  , in some countries, waste from factories is still poured straight into rivers. People who use the water from one of these rivers often get   18  . The water  may become so polluted that it   19   all the fish in the river. When these rivers finally reaches the   20  , it pollutes the ocean.
In many countries with   21  , human waste is piped directly into the sea without being dealt with. This is not   22  . Although the sea itself can break up the waste, beaches   23   become polluted.   24   scientists suggest people take the waste far out to sea in ships where the wind and waves break it down.
In 1989 an international law was passed to   25   people putting waste into the sea. It is now against the   26   to put anything into the sea nearby. Such rubbish as plastics may not be thrown   27   the sea anywhere. Other waste may be put into the sea, either 19 or more than 40 kilometers from land,   28   the nature of the materials.
The   29   of dealing with waste has become so great that several international organizations have been   30   to protect the world and control pollution.

A．as if B．so that C．ever since D．now that

A．Luckily B．Happily C．Unfortunately D．Hopefully

A．sick B．hope C．rich D．fun

A．raises B．feeds C．kills D．breaks

A．pool B．lake C．spring D．sea

A．grassland B．plains C．sea coasts D．deserts

A．safe B．useful C．dirty D．wrong

A．need B．may C．can’t D．needn’t

A．So B．Because C．Since D．But

A．stop B．suggest C．keep D．find

A．school B．organization C．factory D．law

A．out of B．away from C．into D．above

A．depending on B．feeding on C．leading to D．connecting to

A．news B．method C．problem D．disadvantage

A．punished B．set up C．refused D．called at