There weren't any mobile phones a hundred years ago., You have to turn on the computer on before you can use it., Emails go quicker than letters., You can use a mobile telephone to text your friends., MP3 players are better and smaller than CD players., We can take photos on our mobile phones., They went shopping and bought a new computer yesterday., I've got a nice camera so I can take photos., Shall we watch a DVD tonight?, They couldn't use the computer because they didn't know how.,

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