Ex7: Read the text about air pollution .Choose the best options 
Air pollution is a big cities .Evidence shows that air pollution may cause serious health problems for humans and animals . We 1).......................more health problems if we do not lower the air pollution levels .There are some simple actions we can take to reduce air pollution .
First , get familiar with bus or train routes in your city  2)....................with a bus trip at least once a week.The frequent use of public that cause air pollution. You can even walk or bike  3)...................Second ,try to use less packaging .Factories can badly 4)-.......................
start to replace your motorbike travel transportation can help reduce emissions short distances ,air quality when producing plastic , foil and cardboard for packaging .Whatever you are shopping for , remember to choose items with as little packaging as possible . If you have no choice , go for recyclable packaging .
Another good way to reduce air pollution is to manage your household waste .Reusing ,recycling and composting can help reduce a significant  5).............of garbage .That means that less garbage will end up in landfills which are major sources of air pollution .
          1.    A. gets            B.getting            C .will get            D.won't get 
          2.    A.but               B.for                   C. yet                  D .and 
          3.    A.in                 B.for                   C. ,with                D  . at 
          4.    A. drop            B.grow                C .affect             D .keep
          5.    A. amount         B.numer           C .total              D   .level