I & U

 

 

How can you "sm_le"

Without "I"

How can you be "f_ne"

Without "I"

How can you "w_sh"

Without "I"

How can you be  "fr_end"

Without "I"

"I" am very important!

But this "I" can never achieve "s_ccess"

 

 

Without "U".

 

Reference:Internet