Which letter-cluster will replace the question mark (?) to complete the given series?

ZUPK, YTOJ, ?, WRMH, VQLG

Which letter-cluster will replace the question mark (?) to complete the given series?

HFK, KHM, ?, QLQ, TNS

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
 RTM, VZX, ZFI, DLT, ?

Which letter-cluster will replace the question mark (?) to complete the given series?

TQT, ZSB, FUJ, LWR, ?

Which letter-cluster will replace the question mark (?) to complete the given series?

F, E, I, G, L, I, O, ?

Which letter-cluster will replace the question mark (?) to complete the given series?

MBTN, KCSP, IDRR, ?, EFPV

Which letter-cluster will replace the question mark (?) to complete the given series?

LAT, NDR, PGP, ?, TML

Which letter-cluster will replace the question mark (?) to complete the given series?

ZXE ZWD ZVC ? ZTA