If in the word $STABLE$ all the consonants are replaced by the previous letter and all the vowels are replaced by the next letter,which letter will be third from the left end?

If it is possible to make a meaningful word with the second,the fifth,the tenth,and the twelfth letters of the word $METROPOLITAN$,which of the following will be the third letter of that word? If no such word can be made,give $X$ as the answer,and if more than one such word can be made,give $M$ as the answer.

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

Find which one word cannot be made from the letters of the given word: $REPRIMAND$.

How many $D$'s are there in the following series which are immediately followed by $W$ but not immediately preceded by $K$?
$K, D, C, W, K, D, W, N, K, G, D, W, W, D, H, K, V, D, W, Z, D, W$

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