3．A turn off B properly C responsible D break down E teenagers
Addiction is also a problem with more young people．They can spend hours and hours in chat rooms and surfing the net．Sometimes until very late an night．This means they can't work or study（50）Band can have problems keeping friends．
Some studies in the unites states have shown that it（51）Espend many hours，they will go with get lonely and upset．
"Computers can be really useful to children．But parents and teachers sued to help children to learn to use computers in （52）Cand creative ways．"says teacher Jane Shields．"And children should also learn when it is time to （53）Athe computers and head outside to do something different．"
