Which one word can be formed from the following letters?
$a, a, d, e, f, g, r, s, u$

The number of letters skipped between adjacent letters in the series decreases by $2$. Which of the following series follows this rule?

$A$ 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.
$L, A, E, M, V, R$
$1, 2, 3, 4, 5, 6$

If the positions of the third and tenth letters of the word $DOCUMENTATION$ are interchanged,and likewise the positions of the fourth and seventh letters,and the second and sixth letters are also interchanged,which of the following will be the eleventh letter from the right end?

Arrange the given words in the sequence in which they occur in the dictionary and then choose the correct sequence.
$1.$ Preach,$2.$ Praise,$3.$ Precinct,$4.$ Precept,$5.$ Precede

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 the second half of the given alphabet is written in reverse order,which letter will be seventh to the right of the twelfth letter from the left end?