题目内容：

A. according toB. studyC. because ofD. messages  E stop

   Many people use their mobile phones as the alarm clock and are more used to checking emails before sleeping. However， these habits are becoming sleeping problems.

  Several years ago， my boss used to stay up working on her mobile phone and got badly ill  1.that. Now she always leaves her phone in another room at night. And she encourages friends to do so. "I sent each of my friends the same Christmas gift - an alarm clock so that they could  2.  using their phones as the alarm clock" she said.

  If your mobile phone wakes you up in the morning. it may also be keeping you up at night. A survey in 2008 showed that people in mobile phone radiation(辐射) mostly had sleeping problems. And 3. a Swedish study， a quarter of young people in this country feel like there must be phones around them. Most of them feel sorry for not returning messages. So they even have to reply to their friends before sleeping.

So what kind of people prefer to use mobile phones in their bedrooms? A recent 4. has shown that three-quarter people aged between 18 and 34 prefer to sleep with their phones near them. That number falls off a bit in middle age. Only people aged 65 and older are used to leaving the phone in another room while sleeping.