Series Completion

91 A. B, D. G, ?

92 AZ, BY, CX, ?

93 BF, CH, ?, HO, LT

94 JE, LH, OL, SQ, ?

95 FLP, INS. LPV, ?

96 LXF, MTJ, NPN, OLR, ?

97 Which term will replace the question mark in the series : ABD, DGK, HMS, MTB, SBL, ?

98 cx fu ir ? ol ri

99 ejo tyd ins xch ?

100 QPO, SRQ, UTS. WVU, ?