1)I think that all the suggestions in this article are useful because they show how to predispose people to oneself.
2)I think, even in the USA, not all of her advices work.
3)I know some types of body language: body position, gaze and facial expression. You should stand up straight to show self-confidence, look into the eyes of the person with whom you communicate and smile but not that often
4)I frequently use hand gestures in conversations.