按课文填空。     

1．__                 ，____            ，萁在釜下燃，豆在釜中泣。   

2．博学之，                  之，                  之，                 之，                 之。    

3．“守而勿失也”的意思是____                  

4．居里夫人的祖国是                                    。     

5．__                                  ，____                               。孤帆远影碧空尽，唯见长江天际流。