阅读下面材料，在空白处填入1个恰当的或括号内单词的正确形式。
People in different countries have different ____ （way） of doing things. Something that is polite in one country may be quite____ (polite) in another. In Britain, you mustn't lift your bowl to your mouth when you are____(have) some soup. But it's different in China. And in Japan you even needn't worry ____ making noises when you have it. It shows that you are enjoying it. But it is regarded as bad manners in Britain. If you are a ____ (visit) in Mongolia, what manners do they expect you to have? They expect you to have a loud“burp”(打嗝)after you finish ____(eat). Burping shows that you liked the food.
In Britain, you should try not to put your hands on the table when you're having a meal. In Mexico, however, guests are ____ (expect) to keep their hands on the table during a meal. But in Arab countries you must ____ (be) very careful with the hands. You mustn't eat with left hand. Arabs consider it very bad manners eating with the left hand. So, what should you do ____ you are on a visit in another country? You can ask the native people to help you or just watch ____ (careful) and follow them.
2SO3（g）；△H=-196.6kJ/mol