阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
When meeting people at the airport, most people smile and shake hands with people they meet. We know that a smile is usually a sign that people feel friendly and happy, 【小题1】what if we don’t know who the new person is? What if we are not 【小题2】(introduce) by a friend? Sometimes people are dangerous and humans have to find ways to protect 【小题3】 (themself). We have to make sure we can trust people we do not know, and we have to show that we are not dangerous, showing our hands means that we are not armed. In many cultures today, the Western custom of【小题4】 (shake) hands is used. We use our right hand, which is usually 【小题5】 (strong) than the left one. If we are using our hand this way, it cannot be holding a knife or a gun.  It shows that we can trust each other.
Not all cultures use the handshake, and people in many Asian cultures do not always touch another person. Japanese people might cover one hand with 【小题6】 other hand, depending on 【小题7】they are greeting, bow 【小题8】(slight) or quite low. A Muslim will touch his heart, mouth and forehead 【小题9】 (show) respect. They are all keeping their hands busy. In almost all cultures, to smile and show an open right hand 【小题10】 (mean). "Welcome, you are safe with me."