4.
as many people using cellphones, many things are change things changes. Before a cellphone was invented, it was very difficurlt and complicated that when we have contact with our friends and famaily. It was difficult to communicate to friends and loveones.
moreover, Moreover we couldn't do by ourselves what we are interested in or curious about something to watch or learn. even when  When we took a picture, we need to a camera but after invention of a cellphone and upgrading its functions, we can do many things by using only one cellphone.have It has many fuctions like taking pictures,searching for enternet using internet, curculation calculation as well as calling. So cellphones makes our lives us covenient. these  There are good aspects of cellphone however it there are has a bad aspect though,
because a cellphone for someone is too many convinient not to meet other people and lives alone such a odd one.

5.
These day in korea, to stop smoking, many people chose a electronic cigarette.  Many people are using electronic cigarette to stop smoking.
at first it released,When It was the first time to released electric cigarette,everyone can buy it even teenagers too. but after few months later, a government researched about smoking electronic cigarette  has a bad effect of health.
Almost of stuying findings Studies shows said that  an ingredient of electronic ciagarette is nearly same as a real cegarette. so it was categorised to a cigarette and couldn't sell to youngsters. if it woud had been made for helping someone who want to stop smoking, it has was  terrible product I've seen ever known.