你上高楼顶上安装过太阳能吗？到上边时你会发现，在高大的楼房顶上，四周建有一圈较粗的金属棍，并且通到了地下，你知道它的作用是什么吗？如果有人要将它给拆除，请你利用所学的知识向他解释会发生什么后果，并予以制止．

根据短文内容，请将单词填写在题号对应的横线上。

    Without doubt, studying international customs can help avoid ____ (difficult) in today's world of cultural crossroads.

    ____ I get to know more international friends, I learn more about cultural “body language”. Not all cultures greet each other the same way, nor ____ (be )they comfortable in the same way with touching or distance between people. Spoken language can ____ (take) full advantage of to communicate with others, they also express their feelings ____ (use) unspoken “language” through physical distance, actions or posture, English people, for example, do not usually stand very close ____ others or touch strangers as soon as they meet.

    However, people from places like Spain, Italy or South American countries approach others ____ (close) and are more likely ____ (touch) them. Most people around the world now greet each other by shaking hands, ____ some cultures use other greetings as well, such as the Japanese, ____ prefer to bow.