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I tried …… her by phone but the line was busy

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A study shows that teenagers use text messaging to communicate with their friends more than …..

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We should not …….. password with anyone.

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The ….. communication services, along with chat rooms, continue to be an important

part of children’s online interactions.

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The facial expression for happiness, sadness, anger, surprise, fear, and disgust are the same across …….

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John managed ….. his family in England by using Zalo

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Using music, codes or signs to communicate is called ….. communication.

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A non-native speaker most likely can recognize the …. - the non-verbal communication.