Select the letter clusters from among the given options that can replace the question mark (?) in the following series.

CUH, HQK, MMN, RIQ, ?

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

r_vql_mv_lrm_q_rm_ql

Select the letter cluster from among the given options that can replace the question mark (?) in the following series.

MEND, PHJZ, SKFV, VNBR, ?

In each of the following question there is a series of letters. One of the term is missing. Find out the missing term.

Find the missing term in the following series:
GKO, RVZ, TXB, _____

In each of the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

$a \_ bc \_a\_bcda \_ ccd \_bc{d}_{ }\_$

Select the letter clusters from among the given options that can replace the question mark (?) in the following series.

TALT, YAGT, YFGO, DFBO, DKBJ,?