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 Several years ago,cell phones were very e(    ）.Only important people and people w(  ) a lot of money had them.These days,the prices have been greatly falling,and they come in small size and d(  ) colors.So more and more people,e(  ) high school students,have one in their hands.It is ture that it's an e(  ) way to keep in touch with friends at any time and in any place.But in places like classroom,movie theatres,and museums,where everyone should be quiet or talk in a low v(  ),we can also hear the ringing.Some drivers have accidents for u(  ) cell phones while d(  ).Worst of all,some students who can't p(  ) their phone bills do something illegal to get money.So,are cell phones r(  ) help?