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Right Wrong Not mentioned
a; 不填 the; an a; an the; 不填
Right Wrong Not mentioned
was discouraged was enforced by law was prohibited by law was introduced
不填；the 不填；an the; an a; the
have fun, a lot of having fun, a lot of having fun, a variety of have fun, a variety of
（H1N1）flu，there are still some cases for further study.A.As Once If Although
By analyzing the data published in journals like Nature and Ambio. By observing the lead accumulations in different parts of the arctic area. By studying the chemical elements of soil and snow in Northeastern America. By comparing the chemical compositions of leaded gasoline used in various countries.
forests get rid of lead pollution faster than expected lead accumulations in forests are more difficult to deal with lead deposits are widely distributed in the forests of the US the upper layers of soil in forests are easily polluted by lead emissions
people in favor of the trend of democracy advocates of migration between states scientists engaged in the study of population conservatives clinging to old patterns of life
are puzzled by the mystery of forest pollution feel relieved by the use of unleaded gasoline still consider lead pollution a problem lack sufficient means to combat lead pollution
To study Studying Study By studying
the Clean Air Act has not produced the desired results lead deposits in arctic snow are on the increase lead will stay in soil and snow longer than expected the US is the major source of lead pollution in arctic snow
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