Verbal Reasoning - Mental Ability Questions

From the given alternative words, select the word which cannot be formed using the letters of the given word:

ENDEAVOUR

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

JD,?,QK, VP, BV

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

RPK, TSM, VVO, XYQ, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

3, 7, 13, 27, 53, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

BB, DZ, GW, KS, ?

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
U, T, R, O, K ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
14, 22, 33, 47, 64, ?

Select the missing number from the given alternatives?