1) False. You need to keep eye contact around sixty to seventy percent of the time
2) True
3) False. Keep your head straight both horizontally and vertically to be authoritative
4) True
5) True
6) False. Holding palms up is seen as open and friendly. Palms dawn is seen as dominant and possibly agressive, so it is important when it comes to shaking hands.
7) True. If you too far away you'll appear unfriendly. But observe in a group situation how close the other people are to each other. If you move closer to someone, they may back away.
8) True