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     Millions of people are using cell phones today. In many places it is actually considered ______（usual）not to use one. They find that the phones are more than a means of ______ (communicate) ——having a mobile phone shows that they are cool and ______ (connect).
     The ______ (explode) around the world in mobile phone use make some health professional worried. Some doctors are ______ (concern) that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative ______ (public) of such ideas. They say that there is no ______ (prove) that mobile phones are bad for your health.
     On the other hand, signs of change in the issues of the brain and head can be ______ (detect) modern scanning equipment. What is it that makes mobile phones ______ (potential) harmful? The answer is radiation.
     As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a ______(warn) label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.