In the word ‘BRISKLY’, how many pairs of the letters have the same number of letters between them in the word as in alphabet?

How many pairs of letters are there in the word ‘CAMARADERIE’ which have as many letters between them as they have between them in the English alphabet?

CFL, EIK, GLJ, IOI, ? 

Directions: Which word will come in the middle if all of them are arranged alphabetically as in a dictionary?
A. Heaven        B. Hillock         C. Hawker         D. Hilt         E. History

oru_o_uxor_x_rux 

Direction: Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
ab_bba _ _bba _abb _ _a 

Direction: What should come in place of the questions mark (?) in the following letter series?
reoc, pgme, nikg, Ikii, ?