How many independent words can $HEARTLESS$ be divided into without changing the order of the letters and using each letter only once?

Select the series in which the letters skipped in between adjacent letters do not decrease in order.

If the first and second letters in the word $MISFORTUNE$ were interchanged,also the third and the fourth letters,the fifth and the sixth letters and so on,which letter would then be the eighth letter counting to your left?

From the word $BEHIND$,how many independent words can be made without changing the order of the letters and using each letter only once?

$A$ 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.
$R, T, E, O, D, P$
$1, 2, 3, 4, 5, 6$

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