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

ACFD, CFHG, ?, GLLM, IONP

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

RMTS, WGAK, BAHC, GUOU, ?

Which letter cluster will replace the question mark (?) to complete the given series?
 ANGE, DSBB, GXWY, ?

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

TTDS, VMLP, XFTM, ZYBJ, ?

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

AVTE CTRG ERPI GPNK   ?

Which letter-cluster will replace the question mark (?) to complete the given series?
 ZFOE, PYUA, FRAW, VKES, ?

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?

CABQ, CEJC, CIRO, CMZA, ?