阅读短文，然后按要求完成各题。

　　Before you go to another country(A)it is a great help if you know the language and some of the customs of the country．

　　(B)当人们在英国第一次见面时, they say“How do you do?”and shake hands．(C)Usually they do not shake hands when they just meet or say goodbye．But they shake hands after they haven't met for a long time or when they will be away from each other for a long time．

　　Last year, a group of German students went to England for a holiday．Their teacher told them that the English people(D)________ shake hands．So when they met their English friends at the station, they(E)kept their hands behind their backs．The English students had learned that the Germans shake hands as often as possible, so(F)they put their hands(G)________ and got ready to shake hands with them．It made both of them laugh．

1．文中能替代画线部分(A)，(F)的词语和语句是：________; ________．

2．将(B)部分译成英语：________．

3．写出画线部分(C)和(E)的同义词或近义词：________　________

4．在(D)，(G)的空白处填入适当的词语：________　________

5．在文中找出最能解释主题的句子：________