Inserting The Missing Character Questions

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

a _ c a a b _ a _ b c a a b _ a _ b _ a

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

LM_L_NL_N_M_

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

JK_MJ_LM_KL_

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

A_BC_BBC_BB_

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

x_zx_y_z_x_xyy_zzz

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

p_rrq_p_rr_p

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

x_za_yza_xy_aa_

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

ef_he_g_e_gh