What will come in place of the question mark $(?)$ in the following letter-group series based on the English alphabet?
$WC, RE, NI, KO, ?$

In the following letter sequence,how many $n$'s are followed by $m$ but not preceded by $h$?
$a, g, r, h, t, n, m, b, c, n, m, l, b, u, v, n, m, h, e, r, h, n, m, g, f, e, h, n, m, e, c, n, m, w, q, a, n, m, h, l, b$

Arrange the given words in alphabetical order and choose the one that comes in the middle.

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
If every alternate letter starting from $B$ of the given alphabet is written in small letters,and the rest are written in capital letters,how will the month of 'September' be written?

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$I, N, L, A, S, G$
$1, 2, 3, 4, 5, 6$

How many such pairs of letters are there in the word $GOLDEN$,each of which has as many letters between them in the word as in the English alphabet?