There was a _______ tremble in her voice, which showed that she was very nervous at that time.

Body language is a potent form of _______ communication.

Our teacher often said, "Who knows the answer? _______ your hand.”

Tính từ “chế nhạo, mỉa mai” trong tiếng Anh là từ gì?

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I didn't think his comments were very  appropriate  at the time.

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This is the instance where big, obvious non-verbal signals are appropriate.

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When you are in a restaurant, you can raise your hand slightly to show that you need assistance.

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When you see your teacher approaching you, a slight wave to attract his attention is appropriate.