23.　 You must watch out ______ dangerous animals when you walk in the tropical forest in South America.

22.　 We should not look away _____ the person we are speaking to.

21.　 We can often be wrong ______ each other, so it is an amazing thing that we understand each other as well as we do.

20.　 In Asian and South American countries, children are taught that looking directly ______ an adult is not good behavior.

19.　 We show respect ______ people by using different gestures.

18.　 A smile is the universal facial expression----it is intended to put people ______ ease.

17.　 If you close your hand and shake it _______ someone, you are threatening that person.

16.　 It is an interesting study and can help you avoid difficulty ________ communication.

15.　 They are simply the ways _________ which cultures have developed.

14.　 But Ahmed Aziz simply nods ________ the two women.