Complete the following passage with the words or phrases in the box. Each can only be used once.(将下列单词或词组填入空格，每空格限填一词，每个单词或词组只能填一次。)
A. widely B. suffer C. health D.thinner E. complain of |
With such a large rise on mobile phone users around the world over the last 10 years,many people are worried about_1.__ possible problems.For some time, scientists have been thinking that mobile phones could lead to cancer.But so far,there is no strong evidence （证据）for this.
The Norway Institute of Public Health and the UK 's Health Protection Agency both released some studies last year.They said that there was no link found between mobile phone radiation(辐射) and cancer.
However,many mobile phone users often __2.__headaches, dizziness （头晕）and even feeling sick.Last October,a court case （诉讼案件）in Italy said that heavy mobile phone usage had caused brain cancer in one man.
He had used a mobile phone up to six hours a day for 12 years.
But the biggest problem with research now is that it is too early to reach conclusions.Mobile phones have only been__3.__ used since the 1990s,and cancers can take many years to develop.
There is also still a strong argument that mobile phones are a major risk for children."Inner child,small central brain structures are going to be exposed（暴露）,"said Dr.Annie,"Besides,kids have a skell（头盖骨） which is__4.__.
There is much more water in their brain,so there are many reasons that they take in more of the same radiation."
A. take off B. mean C. how D. against E. safely |
Although we still don't know whether using mobile phones can cause cancer,we should try to use our phones__1.__.Here are some tips:
*Use a headset（耳机） or speaker.
Headsets give out much less radiation than phones.Some wireless headsets give out low-level radiation.However,
you should __2.__your headset when you're not talking to anyone.Using a phone with a speaker will also make it safer.
*Listen more, talk less.Your phone gives out radiation when you talk or text,but not when you're listening or getting messages.
*Hold the phone away from your body when you are talking,not _3._your ear.Also,don't keep it in your pocket.
*Choosing texting over talking.Phones give out less radiation when sending texts than when making calls.Texting also keeps radiation away from your head.
* Poor signal?Stay off the phone.Fewer signal bars（信号数） on your phone__4.__that the phone needs to give out more radiation to work.Make and take calls [when your phone has a strong signal.