What should come next in the following letter sequence?

A A B A B C A B C D A B C D E A B C D

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

WFB, TGD, QHG, ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?
MN_O_NN_M_NO

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
MN, PQ, TU, YZ, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
VWX, BCD, HIJ, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
I, V, ? , L

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

BMY, DNW, FOU, ?

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?
J_J_L_KL_JK_MN

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?
l_n_o_m_lm_o