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Having studied Studied To study To have studied
was discouraged was enforced by law was prohibited by law was introduced
People will be forbidden to use mobile phone. People dare not use mobile phone because of its radiation. People will continue to use mobile phone. There will be new restrictions on the use of mobile phone.
found have found had found will find
has found out has been found out have found out have been found out
occupied occupying to be occupied was occupied
After Due to Despite As for
sit; wrote sat; writing seating; writes seated; writing
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
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
find found finding to find
they are transplanted with new brain cells. they learn to do something new. they gain weight in the body. they get new cells from other mic
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
have less imaginations. don’t know how to relax. want to stop their kids’ stomachaches in a short time can find why children suffer from stomachaches.
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