Friends, I'd like to____you something important. Before you go to another country, it is a great help if you know the language and some of the  ____of the country.

    When people meet each other for the____time in Britain, they say “How do you do?” and shake____. Usually they do not shake hands when they just meet or say goodbye. But they shake hands after they haven't____for a long time or when they will be away from each other for a long time.

    Last year a group of German students____to England for holiday. Their teacher____them that the English people hardly shake hands. So when they met their English____at the station, they kept their hands behind their backs. The English students had learned that the____shake hands as often as possible, so they put their hands in front and got ready to shake hands with them. It ____both of them laugh.

如图所示，根据信息，标出电源“+”、“﹣”极和小磁针的“N”极．