A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
AY, CW, EU, ?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
c_bba_cab_ac_ab_ac

Arrange the given words in the sequence in which they occur in the dictionary.
(1) Necrology
(2) Nacromancy
(3) Necropolis
(4) Nacrophilia

If it is possible to make a meaningful word of English together with the first, fifth and eighth letters of the word APTITUDES, how many total words can be made of this type? 

In the following question, select the word which cannot be formed using the letters of the given word.
CAPABILITIES

What is the next term in this series?
L, D, O, E, R, F, ?

Which letter-cluster will replace the question mark (?) to complete the given series?
 ERKV, HYVK, ?, NMRO, QTCD