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

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

If in the English Alphabet each consonant is substituted by the immediate preceding letter and each vowel is substituted by the immediate following letter,then the word $CAPITALISE$ will be written as

If the positions of the first and the sixth letters in the word $DISTRIBUTE$ are interchanged; similarly the positions of the second and the seventh,the third and the eighth and so on,which of the following letters will be the fifth from left after interchanging the positions?

If the positions of the fifth and twelfth letters of the word $GLORIFICATIONS$ are interchanged; and likewise the position of the fourth and fourteenth letters,the third and tenth letters,the second and eleventh letters and the first and thirteenth letters are interchanged,which of the following will be the twelfth letter from the right end?

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