1.
SCD, TEF, UGH, ____, WKL

2.
B2CD, _____, BCD4, B5CD, BC6D

3.
FAG, GAF, HAI, IAH, ____

4.
ELFA, GLHA, ILJA, _____, MLNA

5.
CMM, EOO, GQQ, _____, KUU