MISSING LETTERS VI

The same letter can be added or inserted at least three times into each of the letter strings below to make familiar words. The missing letter will be different for each set. What are the missing letters, and what are the new words?

1. AEN

    OOA

    WEE

2. FUFI

    IEGA

    BIFOD

3. VD

    LNG

    TLBX

 

4. BKN

    LLCT

    NTRNSC 

    MLTA

    NTAL

    NCPENT

    NTATVE

5. IIG

    IUEDO

    OSESE

Answers:

 

1. Missing letter D:

    ADDEND

    DOODAD

    WEDDED

 

2. Missing letter L:

    FULFILL

    ILLEGAL

    BILLFOLD

 

3. Missing letter O:

    VOODOO

    OOLONG

    TOOLBOX

 

4. Missing letter I:

    BIKINI

    ILLICIT

    INTRINSIC 

    MILITIA

    INITIAL

    INCIPIENT

    INITIATIVE

 

5. Missing letter N:

    INNING

    INNUENDO

    NONSENSE