把下面的谚语补充完整。       

1．                                    ，冰在薄处裂。     

2．____                             ，亲口尝梨知酸甜。     

3．____                             ，要看水底万丈深。     

4．花盆里长不出苍松，____                                    。   

5．日日行，不怕千万里；________                          。