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Could you tell me how many __________ channels are there in daily life?

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I prefer face-to-face conversation __________ video call.

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I tried __________ her by phone but the line was busy.

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Non-verbal __________ is popular in our daily life.

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Today there are many different ways to communicate ________, including social networking, chat, VoIP and blogging.

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Have you ever talk with stranger in a chat __________?

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Communication __________ occurs when two people don’t understand what each other is talking about.

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Less people write _________ mails now than 20 years ago.