Romantic (4)

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" ? !! ;))