https://issuu.com/ligucibario/docs/effectivetelephonings__1_/1
https://www.englishclub.com/speaking/telephone.htm
http://usefulenglish.ru/phrases/phrases-exercise-four
http://www.esl-lab.com/eslbasic/telephone-cellphone-1.htm
http://www.bbc.co.uk/worldservice/learningenglish/business/talkingbusiness/unit1telephone/1connecting.shtml
https://www.youtube.com/watch?v=NWawMZxDh9Y
https://www.youtube.com/watch?v=YMxA4Q94qao
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