根据汉语提示，完成下列句子  

1. 没有必要感谢我，这是我的本职工作。  

    There is____                      thank me. This is only my job.  

2. 汉语语法和英语语法大不相同。    

    The grammar of Chinese                                        that of English.  

3. 在中国，初次见面，你应该握手。   

    In China, you're                                       when you meet someone for the first time.  

4. 我最大的挑战是学习怎样得体就餐。    

    My biggest        is learning                                         at the dinner table.  

5. 我们发现日语比英语更难学。    

    We find that Japanese is much                                                than English.